msm: mdss: add dynamic resolution switch support during handoff

Add support to handle dynamic resolution switch request during
cont-splash handoff, even before driver receives the first commit.
The cmd_panel_on is ideally called right before the first kickoff,
if the panel is not already on. Make explicit panel_cmd_on call during
reconfigure to match with the ctl_stop/ctl_start done during the
process of switching. This would make sure complete cleanup and
re-configuration of the ctl is done.

Change-Id: I98469b14284195caaf17a616137a0502e0e398cf
[veeras@codeaurora.org: Resolved conflicts in mdss_mdp.h]
Signed-off-by: Veera Sundaram Sankaran <veeras@codeaurora.org>