drm/msm/sde: add drm fourcc modifier for qcom compressed format

DRM clients need to be able to signal a format modifier
for QCOM compressed format variants.

Conflicts:
	include/uapi/drm/drm_fourcc.h

Change-Id: I8f4d2fd7053ee13ad00c8c377dd77ff929a84905
Signed-off-by: Lloyd Atkinson <latkinso@codeaurora.org>
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>
[narendram@codeaurora.org: resolve merge conflict for
drm_fourcc.h file]
Signed-off-by: Narendra Muppalla <narendram@codeaurora.org>