Revalidate layers when rects change and using scalar.

Revalidate layers when rects change and using scalar.

When using plane scalar, we need to ensure when either
display frame or source rect change the commit can still pass.
Instead of doing full validation, we first do a test commit to
check if the combination is still valid. If the test commit
fails than we fall back to full validation of layers.

Jira: None.
Test: No new regressions on Android.

Signed-off-by: Kalyan Kondapally <kalyan.kondapally@intel.com>