sde: rotator: use shared lock while accessing vbif

Since rotator and MDP shares same VBIF, use a lock which
is shared with MDP while accessing VBIF from rotator.
Update the QOS LVL REMAP reg base address for SDM660.

Change-Id: If9181e563058891ff3fad0e376802d7cd21bd42f
Signed-off-by: Nirmal Abraham <nabrah@codeaurora.org>