Get CtsProviderTestCases building against API.

To help confirm that we're actually testing developer-visible
behaviors, we need to build against public APIs, since there have
been plenty of examples in this suite of "testing" hidden API
behaviors, which are then misleading to developers.

Bug: 120429729
Test: atest cts/tests/tests/provider/
Exempt-From-Owner-Approval: Trivial API annotations
Change-Id: I07fe33e54f611a6060217f0706fb99b809961f4d
diff --git a/core/res/AndroidManifest.xml b/core/res/AndroidManifest.xml
index 4a54bd7..3d294f6 100644
--- a/core/res/AndroidManifest.xml
+++ b/core/res/AndroidManifest.xml
@@ -3329,7 +3329,7 @@
     <permission android:name="com.android.permission.INSTALL_EXISTING_PACKAGES"
         android:protectionLevel="signature|privileged" />
 
-    <!-- @SystemApi Allows an application to clear user data.
+    <!-- @SystemApi @TestApi Allows an application to clear user data.
          <p>Not for use by third-party applications
          @hide
     -->