drm: msm: add dspp caps blob to crtc

All sde crtc's are virtual when they are created. Resources for the crtc
is allocated when crtc is enabled. All crtc's will not have same
capabilities because some of the dspp blocks have additional hardware
blocks. Change exposes additional dspp capabilities dynamically when
crtc is allocated the dspp hardware block.

Change-Id: I93e76a1335574e4ca30d9419ef6cc6e8149e2c3c
Signed-off-by: Gopikrishnaiah Anandan <agopik@codeaurora.org>