powerpc: cache: define ARCH_DMA_MINALIGN for DMA buffer alignment
Signed-off-by: NAnton Staaf <robotboy@chromium.org> Acked-by: NStefan Roese <sr@denx.de> Cc: Mike Frysinger <vapier@gentoo.org> Cc: Lukasz Majewski <l.majewski@samsung.com> Cc: Wolfgang Denk <wd@denx.de> Cc: Stefan Roese <sr@denx.de>
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