Remove A11y node info for SplitInstructionsView

* Individual text view and cancel button still
have their own a11y actions, but top level
view doesn't need one

Test: Tested w/ switches to ensure parent view
doesn't get selected. Tested w/ Talkback to
ensure we can still cancel through talkback
Fixes: 323462927

Change-Id: I60d21f6e768c59f29f51007f56ff784821487895