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H A Dcache.S25828588 Tue May 17 02:38:06 CDT 2016 Masahiro Yamada <yamada.masahiro@socionext.com> arm64: optimize __asm_{flush, invalidate}_dcache_all

__asm_dcache_all can directly return to the caller of
__asm_{flush,invalidate}_dcache_all.

We do not have to waste x16 register here.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: York Sun <york.sun@nxp.com>