drm/amd/display: Update DCN303 SR Exit Latency

[Why]
This update was made for DCN30, but it is needed for DCN303 as well
Signed-off-by: Joshua Aberback <joshua.aberback@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn303/dcn303_resource.c

@@ -146,7 +146,7 @@ struct _vcs_dpi_soc_bounding_box_st dcn3_03_soc = {
 
 		.min_dcfclk = 500.0, /* TODO: set this to actual min DCFCLK */
 		.num_states = 1,
-		.sr_exit_time_us = 12,
+		.sr_exit_time_us = 15.5,
 		.sr_enter_plus_exit_time_us = 20,
 		.urgent_latency_us = 4.0,
 		.urgent_latency_pixel_data_only_us = 4.0,