drm/amdgpu: add IH ip block for IH 4.4.2

Add IH IP handling for IH 4.4.2
Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Le Ma <Le.Ma@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c

@@ -1591,6 +1591,7 @@ static int amdgpu_discovery_set_ih_ip_blocks(struct amdgpu_device *adev)
 	case IP_VERSION(4, 2, 0):
 	case IP_VERSION(4, 2, 1):
 	case IP_VERSION(4, 4, 0):
+	case IP_VERSION(4, 4, 2):
 		amdgpu_device_ip_block_add(adev, &vega20_ih_ip_block);
 		break;
 	case IP_VERSION(5, 0, 0):