drm/amd/display: Avoid divide by zero by initializing dummy pitch to 1
In the Linux kernel, the following vulnerability has been resolved:
drm/amd/display: Avoid divide by zero by initializing dummy pitch to 1
[Why]
If the dummy values in populate_dummy_dml_surface_cfg() aren't updated
then they can lead to a divide by zero in downstream callers like
CalculateVMAndRowBytes()
[How] Initialize dummy value to a value to avoid divide by zero.