powerpc/mm/thp: Remove code duplication

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#	Subject and files	Size	Replies	Applied
1/2	powerpc/mm/thp: Remove code duplication`arch/powerpc/include/asm/tlbflush.h` `arch/powerpc/mm/hash_utils_64.c` `arch/powerpc/mm/hugepage-hash64.c` +1 more	+65 ~~-108~~	0 replies
2/2	powerpc/mm/thp: Use tlbiel if possible`arch/powerpc/include/asm/machdep.h` `arch/powerpc/include/asm/tlbflush.h` `arch/powerpc/mm/hash_native_64.c` +4 more	+37 ~~-13~~	0 replies

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