add ACCESS_BACKGROUND_LOCATION to PermissionsAndroid (#26562)

Summary:
This PR adds ACCESS_BACKGROUND_LOCATION to PermissionsAndroid. Fixes #26541

## Changelog

[Android] [Changed] - add ACCESS_BACKGROUND_LOCATION to PermissionsAndroid
Pull Request resolved: #26562

Test Plan:
```javascript
PermissionsAndroid.ACCESS_BACKGROUND_LOCATION === 'android.permission.ACCESS_BACKGROUND_LOCATION'
```

Differential Revision: D17660062

Pulled By: cpojer

fbshipit-source-id: 3133504c6065ffb2f46e4dff14d2d662348e0987

Libraries/PermissionsAndroid/PermissionsAndroid.js

@@ -43,6 +43,7 @@ const PERMISSIONS = Object.freeze({
   GET_ACCOUNTS: 'android.permission.GET_ACCOUNTS',
   ACCESS_FINE_LOCATION: 'android.permission.ACCESS_FINE_LOCATION',
   ACCESS_COARSE_LOCATION: 'android.permission.ACCESS_COARSE_LOCATION',
+  ACCESS_BACKGROUND_LOCATION: 'android.permission.ACCESS_BACKGROUND_LOCATION',
   RECORD_AUDIO: 'android.permission.RECORD_AUDIO',
   READ_PHONE_STATE: 'android.permission.READ_PHONE_STATE',
   CALL_PHONE: 'android.permission.CALL_PHONE',
@@ -69,6 +70,7 @@ const PERMISSIONS = Object.freeze({
 
 class PermissionsAndroid {
   PERMISSIONS: {|
+    ACCESS_BACKGROUND_LOCATION: string,
     ACCESS_COARSE_LOCATION: string,
     ACCESS_FINE_LOCATION: string,
     ADD_VOICEMAIL: string,