drm/amd/display: Fully switch to dmub for all dcn21 asics

[Why]
On renoir usb-c port stops functioning on resume after f/w update.
New dmub firmware caused regression due to conflict with dmcu.
With new dmub f/w dmcu is superseded and should be disabled.

[How]
- Disable dmcu for all dcn21.

Check dmesg for dmub f/w version.
The old firmware (before regression):
[drm] DMUB hardware initialized: version=0x00000001
All other versions require this patch for renoir.

Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1735
Acked-by: Alex Deucher <[email protected]>
Reviewed-by: Harry Wentland <[email protected]>
Tested-by: Mario Limonciello <[email protected]>
Signed-off-by: Roman Li <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -1356,8 +1356,7 @@ static int amdgpu_dm_init(struct amdgpu_device *adev)
 		switch (adev->ip_versions[DCE_HWIP][0]) {
 		case IP_VERSION(2, 1, 0):
 			init_data.flags.gpu_vm_support = true;
-			if (ASICREV_IS_GREEN_SARDINE(adev->external_rev_id))
-				init_data.flags.disable_dmcu = true;
+			init_data.flags.disable_dmcu = true;
 			break;
 		case IP_VERSION(1, 0, 0):
 		case IP_VERSION(1, 0, 1):