msm: mdss: Add SPI display driver

Add Mdp3 and display SPI interface driver to support SPI panel,
since limited by SPI rate, the current max fps only reach to
27fps and only support RGB565.

Change-Id: Id452b70ed51c1f29aef7b89c1d2f54214c3a7b37
Signed-off-by: Arun kumar <akanak@codeaurora.org>