arm: cache: define ARCH_DMA_MINALIGN for DMA buffer alignment
Signed-off-by: NAnton Staaf <robotboy@chromium.org>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Lukasz Majewski <l.majewski@samsung.com>
Cc: Albert ARIBAUD <albert.u.boot@aribaud.net>
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