drm/amd/display: increasing DRAM BW percent for DCN315

[why]
DML validation fails when we connect two or
more displays with HDR. Need to increase
DRAM BW to make the validation passing.
Following the value from DCN31.

[how]
Change the max DRAM BW DML field to 60%.
Reviewed-by: NCharlene Liu <Charlene.Liu@amd.com>
Acked-by: NQingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: NSung Joon Kim <sungkim@amd.com>
Reviewed-by: NHarry Wentland <harry.wentland@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn315/dcn315_resource.c

@@ -273,7 +273,7 @@ struct _vcs_dpi_soc_bounding_box_st dcn3_15_soc = {
 	.pct_ideal_dram_sdp_bw_after_urgent_pixel_and_vm = 60.0,
 	.pct_ideal_dram_sdp_bw_after_urgent_vm_only = 30.0,
 	.max_avg_sdp_bw_use_normal_percent = 60.0,
-	.max_avg_dram_bw_use_normal_percent = 30.0,
+	.max_avg_dram_bw_use_normal_percent = 60.0,
 	.fabric_datapath_to_dcn_data_return_bytes = 32,
 	.return_bus_width_bytes = 64,
 	.downspread_percent = 0.38,