drm/msm/sde: update scm call by checking all crtc state

scm call must be initiated after all crtc change the
state. SMMU context bank should also be attached or
detached based on all crtc state because they all share
single smmu context bank. Any SCM call out of sync
may cause the pre-mature context bank state and may
lead to invalid transaction request. This patch start
checking all context bank state before detaching secure
display and secure camera session.

Change-Id: I7ab96904a0f770408e2984efb580b0cae8abb65c
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>