efi_loader: Always flush in cache line size granularity
The cache line flush helpers only work properly when they get aligned start and end addresses. Round our flush range to cache line size. It's safe because we're guaranteed to flush within a single page which has the same cache attributes. Reported-by: NMarek Vasut <marex@denx.de> Signed-off-by: NAlexander Graf <agraf@suse.de> Reviewed-by: NAndreas Färber <afaerber@suse.de> Tested-by: NAndreas Färber <afaerber@suse.de>
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