drm/msm/sde: add support for a5x tile pixel formats

Add new modifier for a5x tile and support for a5x tile
pixel format layout calculation.

CRs-Fixed: 2009714
Change-Id: If0d1d6ba8d8d3e36dd5d5aef4a9b217d8e5779ba
Signed-off-by: Alan Kwong <akwong@codeaurora.org>