Migrate frameworks/base/packages/ExternalStorageProvider/tests to androidx.test

See go/jetpack-test-android-migration

Test: make checkbuild
Change-Id: I20090d9bd41f91d239181e42754452d46ec2f3ff
diff --git a/packages/ExternalStorageProvider/tests/Android.bp b/packages/ExternalStorageProvider/tests/Android.bp
index 83427d4..04cf01a 100644
--- a/packages/ExternalStorageProvider/tests/Android.bp
+++ b/packages/ExternalStorageProvider/tests/Android.bp
@@ -14,7 +14,7 @@
     ],
 
     static_libs: [
-        "android-support-test",
+        "androidx.test.rules",
         "mockito-target",
         "truth-prebuilt",
     ],