drm/amd/display: Add debug option for exiting idle optimizations on cursor updates

drm/amd/display: Add debug option for exiting idle optimizations on cursor updates

[Description]
- Have option to exit idle opt on cursor updates
for debug and optimizations purposes

Reviewed-by: Aric Cyr <Aric.Cyr@amd.com>
Acked-by: Jasdeep Dhillon <jdhillon@amd.com>
Signed-off-by: Brandon Syu<Brandon.Syu@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>