msm: mdss: avoid rotator request during secure display session

Secure display works with default orientation. Fail
rotator request during secure session to avoid non-secure
or invalid buffer fetching from rotator smmu.

Change-Id: If99481c8a31a466166edb2b393fef19bc2a983b9
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>