powerpc/85xx: Mark some functions static and add missing includes to fix no previous prototype error

corenet{32/64}_smp_defconfig leads to:

  CC      arch/powerpc/sysdev/ehv_pic.o
arch/powerpc/sysdev/ehv_pic.c:45:6: error: no previous prototype for 'ehv_pic_unmask_irq' [-Werror=missing-prototypes]
   45 | void ehv_pic_unmask_irq(struct irq_data *d)
      |      ^~~~~~~~~~~~~~~~~~
arch/powerpc/sysdev/ehv_pic.c:52:6: error: no previous prototype for 'ehv_pic_mask_irq' [-Werror=missing-prototypes]
   52 | void ehv_pic_mask_irq(struct irq_data *d)
      |      ^~~~~~~~~~~~~~~~
arch/powerpc/sysdev/ehv_pic.c:59:6: error: no previous prototype for 'ehv_pic_end_irq' [-Werror=missing-prototypes]
   59 | void ehv_pic_end_irq(struct irq_data *d)
      |      ^~~~~~~~~~~~~~~
arch/powerpc/sysdev/ehv_pic.c:66:6: error: no previous prototype for 'ehv_pic_direct_end_irq' [-Werror=missing-prototypes]
   66 | void ehv_pic_direct_end_irq(struct irq_data *d)
      |      ^~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/sysdev/ehv_pic.c:71:5: error: no previous prototype for 'ehv_pic_set_affinity' [-Werror=missing-prototypes]
   71 | int ehv_pic_set_affinity(struct irq_data *d, const struct cpumask *dest,
      |     ^~~~~~~~~~~~~~~~~~~~
arch/powerpc/sysdev/ehv_pic.c:112:5: error: no previous prototype for 'ehv_pic_set_irq_type' [-Werror=missing-prototypes]
  112 | int ehv_pic_set_irq_type(struct irq_data *d, unsigned int flow_type)
      |     ^~~~~~~~~~~~~~~~~~~~
  CC      arch/powerpc/sysdev/fsl_rio.o
arch/powerpc/sysdev/fsl_rio.c:102:5: error: no previous prototype for 'fsl_rio_mcheck_exception' [-Werror=missing-prototypes]
  102 | int fsl_rio_mcheck_exception(struct pt_regs *regs)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/sysdev/fsl_rio.c:306:5: error: no previous prototype for 'fsl_map_inb_mem' [-Werror=missing-prototypes]
  306 | int fsl_map_inb_mem(struct rio_mport *mport, dma_addr_t lstart,
      |     ^~~~~~~~~~~~~~~
arch/powerpc/sysdev/fsl_rio.c:357:6: error: no previous prototype for 'fsl_unmap_inb_mem' [-Werror=missing-prototypes]
  357 | void fsl_unmap_inb_mem(struct rio_mport *mport, dma_addr_t lstart)
      |      ^~~~~~~~~~~~~~~~~
arch/powerpc/sysdev/fsl_rio.c:445:5: error: no previous prototype for 'fsl_rio_setup' [-Werror=missing-prototypes]
  445 | int fsl_rio_setup(struct platform_device *dev)
      |     ^~~~~~~~~~~~~
  CC      arch/powerpc/sysdev/fsl_rmu.o
arch/powerpc/sysdev/fsl_rmu.c:362:6: error: no previous prototype for 'msg_unit_error_handler' [-Werror=missing-prototypes]
  362 | void msg_unit_error_handler(void)
      |      ^~~~~~~~~~~~~~~~~~~~~~
  CC      arch/powerpc/platforms/85xx/corenet_generic.o
arch/powerpc/platforms/85xx/corenet_generic.c:33:13: error: no previous prototype for 'corenet_gen_pic_init' [-Werror=missing-prototypes]
   33 | void __init corenet_gen_pic_init(void)
      |             ^~~~~~~~~~~~~~~~~~~~
arch/powerpc/platforms/85xx/corenet_generic.c:51:13: error: no previous prototype for 'corenet_gen_setup_arch' [-Werror=missing-prototypes]
   51 | void __init corenet_gen_setup_arch(void)
      |             ^~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/platforms/85xx/corenet_generic.c:104:12: error: no previous prototype for 'corenet_gen_publish_devices' [-Werror=missing-prototypes]
  104 | int __init corenet_gen_publish_devices(void)
      |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~
  CC      arch/powerpc/platforms/85xx/qemu_e500.o
arch/powerpc/platforms/85xx/qemu_e500.c:28:13: error: no previous prototype for 'qemu_e500_pic_init' [-Werror=missing-prototypes]
   28 | void __init qemu_e500_pic_init(void)
      |             ^~~~~~~~~~~~~~~~~~
  CC      arch/powerpc/kernel/pmc.o
arch/powerpc/kernel/pmc.c:78:6: error: no previous prototype for 'power4_enable_pmcs' [-Werror=missing-prototypes]
   78 | void power4_enable_pmcs(void)
      |      ^~~~~~~~~~~~~~~~~~
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/c90780017b624b91771a3e4240dcbadc68137915.1692684784.git.christophe.leroy@csgroup.eu