mips64: Use __clear_cache builtin instead of cacheflush

[Duane Sand]

mips64 Android bionic has dropped the mips32-specific cacheflush() routine.
Use the compiler's __clear_cache builtin on mips and mips64, as already done for arm and aarch64.
Delete dead code for calling Android's mutated-arg version of mips32 cacheflush().

See https://android-review.googlesource.com/#/c/96717 for previous discussion of this at aosp.
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