msm: sde: secure camera changes for v4l2 rotator

Add support for secure camera buffer handling in SDE rotator.
This change adds detaching the secure context when the buffer
with the secure camera flag is signaled and attaches the secure
context when going back to normal non securer-camera usecases.

Change-Id: Iaff45907e78775975fa3035404dcfd9b27e6e816
Signed-off-by: Abhijit Kulkarni <kabhijit@codeaurora.org>