Adjust function definitions in mmu_oea64.c to avoid clang 15 warnings
With clang 15, the following -Werror warnings are produced:
sys/powerpc/aim/mmu_oea64.c:1947:12: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes] moea64_init() ^ void sys/powerpc/aim/mmu_oea64.c:3257:17: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes] moea64_scan_init() ^ void
This is because moea64_init() and moea64_scan_init() are declared with
(void) argument lists, but defined with empty argument lists. Make the
definitions match the declarations.
MFC after: 3 days