Add CarrierConfig to hide Preset APN setting details

Add new key to hide Preset APN setting details. When the key is set to
true, Preset APN is still shown and selectable in APN list, however,
user cannot enter APN editor view. It means details of Preset APN will
be hidden from user.

Test: manual - check Preset APN setting details are hidden
Bug: 115453290
Change-Id: I8a5c6f92f876d349b304acf89b4ffab86ff3f24b
2 files changed