drm: msm: handle resolution switch for LTM

DPU configuration should be changed when resolution switch happens at
the layer mixer level for ltm feature. Driver should mark ltm properties
as dirty when resolution switch happens. Change handles dynamic resolution
switch for ltm by marking the properties as dirty.

Change-Id: I5ffc8e74c42da6c2902eb42fd2e3ed1b9f9e3e4c
Signed-off-by: Gopikrishnaiah Anandan <agopik@codeaurora.org>