drm/sde: update plane pitches when it's different than fb

Kernel DRM SDE driver doesn't know the alignment requirement from
user space, so it needs to be updated when pitches value when
they are different than fb value.

Change-Id: I392e247330980fcac87b6fbe49a289e0fc473d85
Signed-off-by: Jin Li <jinl@codeaurora.org>