drm/msm/sde: move sde_crtc away from legacy drm vblank apis

Fix up the SDE CRTC to use the DRM framework's updated vblank
related APIs that do not require sub-driver CRTCs to track their
own DRM CRTC IDs.

Change-Id: Idaa208e6c895850e89a8f8189f9169bd1ca67da8
Signed-off-by: Lloyd Atkinson <latkinso@codeaurora.org>