msm: mdss: add capability to parse multiple panel roi alignment

Add device tree parsing logic to parse multiple panel alignment roi for
different panel resolutions. Add alignment roi as part of the panel
timing struct, so that it would be updated whenever resolution switch
happens.

Change-Id: I14ee1a4947312c4c36927adcbffad847f9062fd6
[veeras@codeaurora.org: Resolved conflicts in mdss_dsi_panel.c and
mdss_fb.c]
Signed-off-by: Veera Sundaram Sankaran <veeras@codeaurora.org>