fbdev: msm: Add SPI display support for mdss driver

Add changes to support both mdss and mdp3 driver
for SPI panel display.

Change-Id: Ia2a41e2dbf84d4a0ec2c2018d83cdf2b35c697b5
Signed-off-by: Raghavendra Ambadas <rambad@codeaurora.org>