drm/amd/display: Increase sr enter/exit in rn ddr4 watermark table

[Why]
After removing added latency for HostVM by default, DDR4 sr exit
latencies were no longer large enough for some panels and caused
underflow.

[How]
Add 1us to sr enter/exit watermark.
Signed-off-by: Wyatt Wood <wyatt.wood@amd.com>
Acked-by: Bindu Ramamurthy <bindu.r@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/clk_mgr/dcn21/rn_clk_mgr.c

@@ -618,8 +618,8 @@ static struct wm_table ddr4_wm_table = {
 			.wm_inst = WM_A,
 			.wm_type = WM_TYPE_PSTATE_CHG,
 			.pstate_latency_us = 11.72,
-			.sr_exit_time_us = 6.09,
-			.sr_enter_plus_exit_time_us = 7.14,
+			.sr_exit_time_us = 7.09,
+			.sr_enter_plus_exit_time_us = 8.14,
 			.valid = true,
 		},
 		{