drm/amd/display/dc: set num-dwb = 1 as navi10 asic cap

during navi10 bring up, dwb causes system hang.
to continue debug major issue, disable dwb by
set num-dwb = 0. the hang issue is not reproduced now
by enable num-dwb =1. dc source is shared by all os.
win needs num-dwb = 1.

Signed-off-by: hersen wu <hersenxs.wu@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Roman Li <Roman.Li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c

@@ -661,7 +661,7 @@ static const struct resource_caps res_cap_nv10 = {
 		.num_audio = 7,
 		.num_stream_encoder = 6,
 		.num_pll = 6,
-		.num_dwb = 0,
+		.num_dwb = 1,
 		.num_ddc = 6,
 		.num_vmid = 16,
 #ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT