drm/amd/display: Temporarily disable hostvm on DCN31

commit ba93ddd upstream.

With HostVM enabled, DCN31 fails to pass validation for 3x4k60. Some Linux
userspace does not downgrade one of the monitors to 4k30, and the result
is that the monitor does not light up. Disable it until the bandwidth
calculation failure is resolved.

Reviewed-by: Sun peng Li <sunpeng.li@amd.com>
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Zaeem Mohamed <zaeem.mohamed@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

@@ -890,7 +890,7 @@ static const struct dc_debug_options debug_defaults_drv = {
 	.disable_z10 = true,
 	.enable_legacy_fast_update = true,
 	.enable_z9_disable_interface = true, /* Allow support for the PMFW interface for disable Z9*/
-	.dml_hostvm_override = DML_HOSTVM_NO_OVERRIDE,
+	.dml_hostvm_override = DML_HOSTVM_OVERRIDE_FALSE,
 	.using_dml2 = false,
 };