Apply @hide / @SystemApi to android.telecom.*

Move the android.telecom.* namespace back to @hide, and also mark it
with @SystemApi so that system-privileged apps can use them.

Bug: 18302450
Change-Id: I33ae1b9b0dfdb1c5eff51ca3c829196bcfc9411c
diff --git a/core/res/AndroidManifest.xml b/core/res/AndroidManifest.xml
index ffe2b60..216a901 100644
--- a/core/res/AndroidManifest.xml
+++ b/core/res/AndroidManifest.xml
@@ -1269,26 +1269,31 @@
         android:description="@string/permdesc_use_sip"
         android:label="@string/permlab_use_sip" />
 
-    <!-- Protects the ability to register any PhoneAccount with
+    <!-- @SystemApi Protects the ability to register any PhoneAccount with
          PhoneAccount#CAPABILITY_SIM_SUBSCRIPTION. This capability indicates that the PhoneAccount
-         corresponds to a device SIM. -->
+         corresponds to a device SIM.
+         @hide -->
     <permission android:name="android.permission.REGISTER_SIM_SUBSCRIPTION"
         android:permissionGroup="android.permission-group.PHONE_CALLS"
         android:protectionLevel="system|signature"
         android:description="@string/permdesc_register_sim_subscription"
         android:label="@string/permlab_register_sim_subscription" />
 
-    <!-- Protects the ability to register any PhoneAccount with
-         PhoneAccount#CAPABILITY_CALL_PROVIDER. -->
+    <!-- @SystemApi Protects the ability to register any PhoneAccount with
+         PhoneAccount#CAPABILITY_CALL_PROVIDER.
+         @hide -->
     <permission android:name="android.permission.REGISTER_CALL_PROVIDER"
         android:permissionGroup="android.permission-group.PHONE_CALLS"
+        android:protectionLevel="system|signature"
         android:description="@string/permdesc_register_call_provider"
         android:label="@string/permlab_register_call_provider" />
 
-    <!-- Protects the ability to register any PhoneAccount with
-         PhoneAccount#CAPABILITY_CONNECTION_MANAGER -->
+    <!-- @SystemApi Protects the ability to register any PhoneAccount with
+         PhoneAccount#CAPABILITY_CONNECTION_MANAGER
+         @hide -->
     <permission android:name="android.permission.REGISTER_CONNECTION_MANAGER"
         android:permissionGroup="android.permission-group.PHONE_CALLS"
+        android:protectionLevel="system|signature"
         android:description="@string/permdesc_connection_manager"
         android:label="@string/permlab_connection_manager" />