move @hide API from IoUtils

IOUtils.closeQuitely is a trivial utility, simply make a copy
inside telephony.
TODO: consider make a util API file if such function is referenced
multiple places.

Bug: 137202333
Test: Build + Unit test
Merged-In: I9988abb46d8ae114aab8a3846efaf44641379689
Change-Id: I9988abb46d8ae114aab8a3846efaf44641379689
(cherry picked from commit 5cba1ed9)