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>

drivers/gpu/drm/amd/display/dc/dc.h

@@ -761,7 +761,8 @@ union dpia_debug_options {
 		uint32_t extend_aux_rd_interval:1; /* bit 2 */
 		uint32_t disable_mst_dsc_work_around:1; /* bit 3 */
 		uint32_t enable_force_tbt3_work_around:1; /* bit 4 */
-		uint32_t reserved:27;
+		uint32_t disable_usb4_pm_support:1; /* bit 5 */
+		uint32_t reserved:26;
 	} bits;
 	uint32_t raw;
 };