Use structural equality for A11yNodeInfo#mChildNodeIds

This reintroduces I508df9e4346e304b8ae56cc38b17e9a940d941f1
with the addition of missing nullchecks

A11yNodeInfo#writeToParcel relied on LongArray#equals to avoid
storing it if it's the default value, but because the equality
is be by reference, it would store it every time.
This fixes that.

Test: a11y cts
Change-Id: I8fadffb2508d819ae9a9db8c4298e8941a349627
Fixes: 72460870
2 files changed