xfs: validate COW fork sequence counters during buffered writes

In the previous patch, we transformed the iomap revalidation code to use
an explicit context object where data and cow fork sequence counters are
tracked explicitly.  The existing validation function only validated the
data fork sequence counter, so now let's make it validate both.

I /think/ this isn't actually necessary here because we're writing to
the page cache, and the page state does not track or care about cow
status.  However, this question came up when Dave and I were chatting
about this patchset on IRC, so here it is for formal consideration.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>

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