aidl: tests: add PersistableBundle integration tests

Add integration tests for PersistableBundle. Since the aidl
generator currently does not support out params for
PersistableBundles (b/25998882), we do not test for this.

Also:
- Rename ConfirmParcelables() to ConfirmSimpleParcelables().
  This makes the addition of ConfirmPersistableBundles() less
  confusing, since PersistableBundles are also Parcelables.
- Minor formatting changes in aidl_test_service.cpp.

BUG: 25815410
Change-Id: Ib20f6ecf47dec556929b3fe30e45aa7e410d9054
TEST: aidl builds successfully.
TEST: integration-test.py passes.
diff --git a/tests/aidl_test_client.cpp b/tests/aidl_test_client.cpp
index 7ec1c6f..0663f2c 100644
--- a/tests/aidl_test_client.cpp
+++ b/tests/aidl_test_client.cpp
@@ -83,7 +83,9 @@
 
   if (!client_tests::ConfirmReverseBinderLists(service)) return 1;
 
-  if (!client_tests::ConfirmParcelables(service)) return 1;
+  if (!client_tests::ConfirmSimpleParcelables(service)) return 1;
+
+  if (!client_tests::ConfirmPersistableBundles(service)) return 1;
 
   if (!client_tests::ConfirmFileDescriptors(service)) return 1;