Rename KEY_VOICE_PRIVACY_DISABLE_BOOL -> KEY_VOICE_PRIVACY_DISABLE_UI_BOOL

Disabling voice privacy sounds scary. Update this config variable name
to what it actually does, which is to hide some settings UI.

Bug: 21571894
Change-Id: I165f9e91cee6b7c7572d8540d63519f1454ece9e
(cherry picked from commit 38c58552d3d082092fc7b19ce01dfa68dd53e111)
2 files changed