Dump RSSI and Link Layer Stats in Bug Report when screen off

Always poll RSSI and link layer stats during a bug report, even when the screen
is off. The RSSI and link layer stats will be shown in the "WifiScoreReport"
section of the bug report.

Bug: 119727583
Test: ran `adb bugreport` when screen is on, verify that it does not crash
Test: ran `adb bugreport` when screen is off, verify link layer stats show in BR
Test: ran `adb bugreport` when the device is disconnected from Wifi, verify that
it does not crash
Test: frameworks/opt/net/wifi/tests/wifitests/runtests.sh

Change-Id: I9aa47225f109751fbae68fd28c68b358fe67fef6
3 files changed