Fix create bluetooth dialog repeatedly

When the screen rotates, currently the startActivityForResult() within
RequestPermissionActivity could be called multiple times, so the
multiple RequestPermissionHelperActivity will be created, which caused
the issue.

Replace RequestPermissionHelperActivity with AlertDialog (as an
unfinished TODO of RequestPermissionHelperActivity) can fix this issue.

Fix: 243601277
Test: Manually with adb shell commands
Test: Unit test
Change-Id: If1e2b2807b69a87bbcfffa543ee0da134d4c4312