Use IBinder pointer when hashing in InputTransferToken.

Hashing the IBinder java object from JNI doesn't always yield the
same value so instead hash the native IBinder pointer

Test: SurfaceControlViewHostTests#requestFocusWithMultipleWindows
Test:
AccessibilityEmbeddedHierarchyTest#testEmbeddedView_PerformActionTransfersWindowInputFocus
Test: SurfaceControlInputReceiverTests#testTransferGestureFromHostToEmbedded

Fixes: 329491286
Fixes: 329909546
Fixes: 329950249
Change-Id: Ie613de91a0223dbbfa6f677339fd97f18213098f