msm: mdss: Ensure secure restore cfg before first secure session

Currently secure restore cfg is called in LK and then after every
resume or after MDSS comes out of power collapse. As per TZ
recommendation, ensure restore cfg is called before first secure
session and first suspend resume.

Change-Id: I0cc820636da4f4a137bdaadc737ed71d78940b10
Signed-off-by: Jayant Shekhar <jshekhar@codeaurora.org>