msm: mdss: ad: detect changes in resolution within ad config

Whenever resolution switch happens, ad needs to be reconfigured with
new resolution. Detect these changes and program frame size
accordingly.

Change-Id: Iac4e36c19d55d56de99318e13fd7435bdfac3a84
Signed-off-by: Adrian Salido-Moreno <adrianm@codeaurora.org>