Avoid marshalling default-valued fields

Test: 1. AccessibilityNodeInfoTest#testMarshaling
2. Hack the check from the above test to run on each parcel, then turn on
TalkBack and ensure to system crashes and stack traces in logcat
3. A11y CTS: CtsAccessibilityServiceTestCases, CtsAccessibilityTestCases,
CtsUiAutomationTestCases
Bug: 33949542

Change-Id: I2cef9fcef9d6f84334614b0e81c6717484ef3436