msm: sde: Update capability for SDE rotator

MDSS3.x rotator supports downscaling and output compression together.
Add capability to show usermode driver to allow best bandwidth saving
for such usecase. Also rename wb_count to queue_count to reflect the
exact meaning of the HW capability.

CRs-Fixed: 1093816
Change-Id: I38cad55e06ef6496747ba03bfcfaf4328a347c8f
Signed-off-by: Benjamin Chan <bkchan@codeaurora.org>