Update libva headers to the latest release (1.2.1).

third_party/libva/va/egl/va_egl.h

Index: third_party/libva/va/egl/va_egl.h
diff --git a/third_party/libva/va/egl/va_egl.h b/third_party/libva/va/egl/va_egl.h
new file mode 100644
index 0000000000000000000000000000000000000000..4243d0b401edc72cfe1e9dffe300822b8ec8f49b
--- /dev/null
+++ b/third_party/libva/va/egl/va_egl.h
@@ -0,0 +1,27 @@
+#ifndef _VA_EGL_H_
+#define _VA_EGL_H_
+
+#include <va/va.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef void*   EGLClientBuffer;
+
+/*This function is used to get EGLClientBuffer
+ * (lower 16bits is buffer index, upper 16bits 
+ * is BC device id.) from surface id. Application
+ * should maintain EGLClientBuffer itself.*/
+
+VAStatus vaGetEGLClientBufferFromSurface (
+    VADisplay dpy,
+    VASurfaceID surface,	
+    EGLClientBuffer *buffer     /* out*/
+);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _VA_EGL_H_ */