Revert "hrtimer: Report offline hrtimer enqueue"

This reverts commit a012efe0 which is
commit dad6a09f upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: I60b729d7bdef7b6fdfcd1b32dd5f8b10242283f8
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>