radeon/winsys: add vcn enc ring type

New ring type is needed for vcn encode

Signed-off-by: Boyuan Zhang <boyuan.zhang@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
diff --git a/src/gallium/drivers/radeon/radeon_winsys.h b/src/gallium/drivers/radeon/radeon_winsys.h
index e8c486c..c03090b 100644
--- a/src/gallium/drivers/radeon/radeon_winsys.h
+++ b/src/gallium/drivers/radeon/radeon_winsys.h
@@ -78,6 +78,7 @@
     RING_VCE,
     RING_UVD_ENC,
     RING_VCN_DEC,
+    RING_VCN_ENC,
     RING_LAST,
 };