drm/amd/display: Limit display scaling to up to 4k for DCN 3.1

[why]
The existing limit was mistakenly bigger than 4k for DCN 3.1

Reviewed-by: Zhan Liu <[email protected]>
Acked-by: Solomon Chiu <[email protected]>
Signed-off-by: Nikola Cornij <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
Cc: [email protected]

Author: Nikola Cornij

drivers/gpu/drm/amd/display/dc/dcn31/dcn31_resource.c

@@ -928,7 +928,7 @@ static const struct dc_debug_options debug_defaults_drv = {
 	.disable_dcc = DCC_ENABLE,
 	.vsr_support = true,
 	.performance_trace = false,
-	.max_downscale_src_width = 7680,/*upto 8K*/
+	.max_downscale_src_width = 3840,/*upto 4K*/
 	.disable_pplib_wm_range = false,
 	.scl_reset_length10 = true,
 	.sanity_checks = false,