msm: Display: Add support for "Continuous Splash Screen" feature.

The image displayed on the screen by the android bootloader
driver should continue till the android animation shows up.
Delay the display initialization for MDP, display dependent clocks
and panel power on functions.

Change-Id: Iaec53879def6f4a9d2f6b7b8090f572e64e55d87
Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>
Signed-off-by: Chandan Uddaraju <chandanu@codeaurora.org>