msm: display: panel recovering from suspend

In suspend state, fb_open cannot turn on panel, need save this info
for resume.
In suspend state, blank setting needs be cached to be used at resuming.

(cherry picked from commit 9f7c82eaed91b9950d5ff5b1bbc77c6221a98afb)

Change-Id: I222f706774d0eed61a1cba6e8154ffd2337c2563
Signed-off-by: Ken Zhang <kenz@codeaurora.org>
Signed-off-by: Siddhartha Agrawal <agrawals@codeaurora.org>