tree 7ef5f68c7f0d4f6abc1acc2716bce2c93ffc2bc8
parent 94f52a39c2c82fd296ef1e906a5f474f10936c81
author Yin-Chia Yeh <yinchiayeh@google.com> 1521060623 -0700
committer Yin-Chia Yeh <yinchiayeh@google.com> 1521062375 -0700

Camera: various external camera fixes

1. Add EXIF MAKE/MODEL tag
2. Add retry loop for V4L2 open failure
3. Do not add external camera if ExternalCameraDevice cannot be
   initialized

Bug: 72261912
Bug: 72569850
Change-Id: I06df1fbbb4afabea1a9a74aca9e288b24966cb0b