drm/radeon: add driver option to disable vce block.

Quite few suspend/hibernation bugs are related to this block. Add
an option to disable those as a work around.

Reviewed-by: Christian König <[e-mail]>
Signed-off-by: Jérôme Glisse <[e-mail]>
Cc: Alex Deucher <[e-mail]>
Cc: Christian König <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/radeon/radeon.h

···
 extern int radeon_auxch;
 extern int radeon_mst;
 extern int radeon_uvd;
+extern int radeon_vce;
 
 /*
  * Copy from radeon_drv.h so we don't have to include both and have conflicting

drivers/gpu/drm/radeon/radeon_asic.c

···
 
 	if (!radeon_uvd)
 		rdev->has_uvd = false;
+	if (!radeon_vce)
+		rdev->has_vce = false;
 
 	return 0;
 }

drivers/gpu/drm/radeon/radeon_drv.c

···
 int radeon_auxch = -1;
 int radeon_mst = 0;
 int radeon_uvd = 1;
+int radeon_vce = 1;
 
 MODULE_PARM_DESC(no_wb, "Disable AGP writeback for scratch registers");
 module_param_named(no_wb, radeon_no_wb, int, 0444);
···
 
 MODULE_PARM_DESC(uvd, "uvd enable/disable uvd support (1 = enable, 0 = disable)");
 module_param_named(uvd, radeon_uvd, int, 0444);
+
+MODULE_PARM_DESC(vce, "vce enable/disable vce support (1 = enable, 0 = disable)");
+module_param_named(vce, radeon_vce, int, 0444);
 
 static struct pci_device_id pciidlist[] = {
 	radeon_PCI_IDS