[Thread] disable handling of airplane mode

This is basically a revert of aosp/3079292 to disable the handling of
the airplane mode. The cause is that there are a few reported ANR issues
on real devices and they points to the handlers here in Thread module.

Before we figure out the root cause, let's disable the airplane mode
handler in Thread to recover the presubmit tests.

Bug: 353115531
Bug: 352484437
Bug: 350586929
Bug: 352316041
Change-Id: I569ced2855658f965ddf51242600ee3c325781a7
2 files changed