Depend on weston (virtual package) instead of weston-imx.

Change-Id: Ifc48b712a9552f4e6b98a0eba074292e3a9b0a07
diff --git a/debian/control b/debian/control
index 2db0087..40fba54 100644
--- a/debian/control
+++ b/debian/control
@@ -26,7 +26,7 @@
          python3-numpy,
          python3-pil,
          python3-protobuf,
-         weston-imx
+         weston
 Description: EdgeTPU camera API
  API to run inference on image data coming from the camera.