msm: sde: check stride alignment before disabling partial writes

Only disable partial writes if the stride is a multiple of 32
bytes. Otherwise, the partial read-modify-write behavior is
needed to avoid corrupting the output image.

CRs-Fixed: 2056485
Change-Id: Ia86dfc4561f96f7774db1e8529ee5a553c584426
Signed-off-by: Clarence Ip <cip@codeaurora.org>