drm/amd/display: Add dpia debug option to control power management

[Why]
To provide option to dpia control power management

[How]
By adding disable_usb4_pm_support bit field in dpia_debug option to
control dpia power management

Reviewed-by: Jun Lei <jun.lei@amd.com>
Signed-off-by: Meenakshikumar Somasundaram <meenakshikumar.somasundaram@amd.com>
Signed-off-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>