No need to check WRITE_SETTINGS permission in ContentProvider

Permission checks are enforced within the SettingsProvider specifically
for SECURE/SYSTEM/GLOBAL. Now WRITE_SETTINGS is runtime, so it shouldn't
apply to all the settings types.

Bug: 22044704
Change-Id: I9ed25d96b2fa4f46d3d049efa4300cd1d37bbd24

packages/SettingsProvider/AndroidManifest.xml

@@ -15,7 +15,6 @@
         <provider android:name="SettingsProvider" android:authorities="settings"
                   android:multiprocess="false"
                   android:exported="true"
-                  android:writePermission="android.permission.WRITE_SETTINGS"
                   android:singleUser="true"
                   android:initOrder="100" />
     </application>