powerpc/64e: Define mmu_pte_psize static

mmu_pte_psize is only used in the tlb_64e.c, define it static.

Fixes: 25d21ad6 ("powerpc: Add TLB management code for 64-bit Book3E")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202408011256.1O99IB0s-lkp@intel.com/Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/beb30d280eaa5d857c38a0834b147dffd6b28aa9.1724157750.git.christophe.leroy@csgroup.eu

arch/powerpc/mm/nohash/tlb_64e.c

@@ -33,7 +33,7 @@
  * though this will probably be made common with other nohash
  * implementations at some point
  */
-int mmu_pte_psize;		/* Page size used for PTE pages */
+static int mmu_pte_psize;	/* Page size used for PTE pages */
 int mmu_vmemmap_psize;		/* Page size used for the virtual mem map */
 int book3e_htw_mode;		/* HW tablewalk?  Value is PPC_HTW_* */
 unsigned long linear_map_top;	/* Top of linear mapping */