msm: mdss: Fix race condition during secure display transitions

When we release the ov_lock in kickoff after the commit sequence,
there is a chance that validate call for the next commit updates
the secure display transition state. This might result in early
secure display configuration (enable/disable), which will cause
SMMU faults. To avoid this, store the secure display transition
state at the start of kickoff locally, and use it for secure display
configurations.

Change-Id: Ib7bfe23be30d3ee70e346e388bf112bc1d0c4e99
Signed-off-by: Krishna Chaitanya Devarakonda <kdevarak@codeaurora.org>