Add libgstreamer-gl package

To make sure the local GPU patch is applied.

Change-Id: If4039be49840e6c44f5ccbfee6442c5451b15dc2
diff --git a/debian/control b/debian/control
index 6b2efe0..1dc9c8d 100644
--- a/debian/control
+++ b/debian/control
@@ -18,6 +18,7 @@
          excelsior-wlan,
          gst-shark,
          iw,
+         libgstreamer-gl1.0-0 (>= 1.14.4-2+mtk),
          linux-image-4.19.125-mtk,
          mendel-core,
          mtk-board-audio,