msm: mdss: clean up ctl during cont splash resolution change

During boot-up, if continuous splash screen is enabled, handoff
will populate the controller and other structures after reading
hardware info. If there is a resolution switch, clear the
handoff data so that the data can be reconfigured with new
resolution info.

Change-Id: Ia524136283711e95879936603bb53c5e8f263ea6
Signed-off-by: Ajay Singh Parmar <aparmar@codeaurora.org>
Signed-off-by: Tatenda Chipeperekwa <tatendac@codeaurora.org>