MIPS: Octeon: Mark some functions __init in smp.c

octeon_smp_setup and octeon_prepare_cpus are just used during initialization
period, so mark them as __init. And, octeon_prepare_cpus is just used in smp.c,
so make it static as well.
Signed-off-by: Yang Shi <yang.shi@windriver.com>
Cc: david.daney@cavium.com
Cc: linux-kernel@vger.kernel.org
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/12574/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/cavium-octeon/smp.c

@@ -127,7 +127,7 @@ static void octeon_smp_hotplug_setup(void)
 #endif
 }
 
-static void octeon_smp_setup(void)
+static void __init octeon_smp_setup(void)
 {
 	const int coreid = cvmx_get_core_num();
 	int cpus;
@@ -228,7 +228,7 @@ static void octeon_init_secondary(void)
  * Callout to firmware before smp_init
  *
  */
-void octeon_prepare_cpus(unsigned int max_cpus)
+static void __init octeon_prepare_cpus(unsigned int max_cpus)
 {
 	/*
 	 * Only the low order mailbox bits are used for IPIs, leave