Improve BaseBundle#kindofEquals

If both BaseBundles are empty, we can infer that without needing to
unparcel any of them.

Test: atest FrameworksCoreTests:android.os.BundleTest

Bug: 146037505
Change-Id: I04c28cdd1293227d9887b0c17e178f61328c1959
Merged-In: I04c28cdd1293227d9887b0c17e178f61328c1959