Add WakeupController class.

Adds a barebones WakeupController class. It listens for changes to
Settings values to determine whether or not it is enabled.

Adds the WakeupController to WifiInjector.

Bug: 64094365
Test: frameworks/opt/net/wifi/tests/wifitests/runtests.sh
Change-Id: I471ee381f425388857f4bb0bb34fee61ee8b0c3b
3 files changed