video: add udmabuf allocator

wire/jay_screenshot.txt

@@ -14,3 +14,19 @@ event dmabuf {
 event error {
     msg: str,
 }
+
+event drm_dev (since = 6) {
+    drm_dev: fd,
+}
+
+event plane (since = 6) {
+    fd: fd,
+    offset: u32,
+    stride: u32,
+}
+
+event dmabuf2 (since = 6) {
+    width: i32,
+    height: i32,
+    modifier: pod(u64),
+}