Option to disable safe volume warning [2/2]

* This message appears when using headphones and listening to music
* This setting will be applied at boot, so a reboot is necessary

Change-Id: I2cdee8def41105df9266126d694cfd6c22ef4461
[5/7] Settings: Blacklist support

Base: https://gerrit.omnirom.org/#/c/5668/
telephony: https://gerrit.omnirom.org/#/c/6347/
InCallUI: https://gerrit.omnirom.org/#/c/5669/
Mms: https://gerrit.omnirom.org/#/c/5671/
TelephonyProvider: https://gerrit.omnirom.org/#/c/5012/
Telephony: https://gerrit.omnirom.org/#/c/5010/

Change-Id: I6739bbd72f64095a324f6c6188e2eac53a2783b9