[Telephony] Clean up: remove getApnTypeStringInternal

Bug: 181696914
Test: make
Merged-In: Ia79bb9eaa1fc43a2995730da47289274f94d67fe
Change-Id: Ia79bb9eaa1fc43a2995730da47289274f94d67fe
(cherry picked from commit 6930ca1e6d0a4bca33c376a227a5954bfb243e2d)
1 file changed