fbdev: msm: Add snapshot of mdss driver

This a snapshot of mdp and dsi driver fixs from msm-4.4
as of 'commit 3dd5febeecd1 ("fbdev: msm: Call vsync_handler
only after ctl start"). These changes bring in all display
features and bug fixes for SDM660 and msm8998 from msm-4.4.
On top of this, additional changes were done to adapt the
display driver to iommu,sync framework changes in msm-4.14.

Change-Id: I6d4aabb5f2f156c701209352f3364999bb91fd60
Signed-off-by: Raghavendra Ambadas <rambad@codeaurora.org>
Signed-off-by: Nirmal Abraham <nabrah@codeaurora.org>