[RTT2] Add RTT availability API

Add a broadcast + availability API allowing apps to keep track of when
Wi-Fi RTT is available.

Bug: 65014694
Test: unit tests and integration tests
Change-Id: I06f4f022c3fc6200be2308931b1fc886ae0ba37e
diff --git a/core/res/AndroidManifest.xml b/core/res/AndroidManifest.xml
index 507a431..77bfec3 100644
--- a/core/res/AndroidManifest.xml
+++ b/core/res/AndroidManifest.xml
@@ -326,6 +326,7 @@
     <protected-broadcast android:name="android.net.wifi.WIFI_CREDENTIAL_CHANGED" />
     <protected-broadcast android:name="android.net.wifi.WIFI_SCAN_AVAILABLE" />
     <protected-broadcast android:name="android.net.wifi.aware.action.WIFI_AWARE_STATE_CHANGED" />
+    <protected-broadcast android:name="android.net.wifi.rtt.action.WIFI_RTT_STATE_CHANGED" />
     <protected-broadcast android:name="android.net.wifi.SCAN_RESULTS" />
     <protected-broadcast android:name="android.net.wifi.RSSI_CHANGED" />
     <protected-broadcast android:name="android.net.wifi.STATE_CHANGE" />