arch: Use asm-generic header for asm/mmiowb.h
Hook up asm-generic/mmiowb.h to Kbuild for all architectures so that we can subsequently include asm/mmiowb.h from core code. Cc: Masahiro Yamada <yamada.masahiro@socionext.com> Cc: Arnd Bergmann <arnd@arndb.de> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
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