Update third_party/libva to version 1.7.1

third_party/libva/va/va_dec_vp9.h

Index: third_party/libva/va/va_dec_vp9.h
diff --git a/third_party/libva/va/va_dec_vp9.h b/third_party/libva/va/va_dec_vp9.h
index 2deddb0b4fc229f47829ce48619d0926a88028f2..eff80e1da934c26cddb0328761e2961581e93add 100644
--- a/third_party/libva/va/va_dec_vp9.h
+++ b/third_party/libva/va/va_dec_vp9.h
@@ -182,10 +182,15 @@ typedef struct  _VADecPictureParameterBufferVP9
     uint8_t                 segment_pred_probs[3];
 
     /** \brief VP9 Profile definition
-     *  value can be 0 or 1.
+     *  value range [0..3].
      */
     uint8_t                 profile;
 
+    /** \brief VP9 bit depth per sample
+     *  same for both luma and chroma samples.
+     */
+    uint8_t bit_depth;
+
     /**@}*/
 
 } VADecPictureParameterBufferVP9;