msm: mdss: dsi: add support for multiple panel timing settings

Some DSI panels support more than one resolution or panel timing.
Add support to parse and configure different panel timing settings
and ability to switch between them dynamically if possible.

CRs-fixed: 873962
Change-Id: I532587eaa763499c9d51909937339093cd74a8cf
Signed-off-by: Chandan Uddaraju <chandanu@codeaurora.org>
Signed-off-by: Adrian Salido-Moreno <adrianm@codeaurora.org>
[veeras@codeaurora.org: Resolve merge conflicts in mdss-dsi-panel.txt,
 mdss_dsi.c, mdss_dsi_host.c, mdss_dsi_panel.c]
Signed-off-by: Veera Sundaram Sankaran <veeras@codeaurora.org>