drm/amd/display: increase polling interval for fbc status update

1.Fixing error message:
"wait counter exceeded, changes to HW not applied"
2. Added "FBC status changed to 0/1" logs

Signed-off-by: Roman Li <Roman.Li@amd.com>
Reviewed-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>