Make a11y node info parceling more robust

Fix a bug where a malformed Parceled representation
of an AccessibilityNodeInfo could be used to mess with
Bundles as they get reparceled.

Bug: 36491278
Test: Verified that POC no longer works, a11y cts still passes.
Change-Id: I10f24747e3ab87d77cd1deba56db4526e3aa5441
(cherry picked from commit 687bb44b437f7bb24dd3dddf072c2f646308e2ca)
(cherry picked from commit 487d8697333b1e7784394b9cd96cb590b047c513)
1 file changed