platform: msm_shared: add delay to make sure FB ready before backlight on

Add SPI cmd post function for SPI panel to make sure FB ready
before backlight on.

Change-Id: Ibee25415634863aea0f6fb7ea2809f7348ac9952
Signed-off-by: Wenjun Zhang <wjzhan@codeaurora.org>
3 files changed