When the data cache is PIPT or VIPT non-aliasing, and cache operations
are broadcast by the hardware, we can always postpone the flush in
flush_dcache_page().  A similar change was done for ARM64 in commit
b5b6c9e9 ("arm64: Avoid cache flushing in flush_dcache_page()").
Reviewed-by: NCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: NRabin Vincent <rabinv@axis.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>