Remove opencv3 from the manifest

Nothing is using it.

Bug: 34621082
Test: builds
Change-Id: Id958566059812a528bc90cad90d336f2687f54c8
1 file changed
tree: 7dbb16b73733eb0af180d445a419355b57fa049e
  1. GLOBAL-PREUPLOAD.cfg
  2. default.xml