Option to disable safe volume warning [1/2]

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

Change-Id: I64e097d548843ca4116373ecc44e45da95c207a8
[1/7] Base: Blacklist support

telephony: https://gerrit.omnirom.org/#/c/6347/
InCallUI: https://gerrit.omnirom.org/#/c/5669/
Mms: https://gerrit.omnirom.org/#/c/5671/
Settings: https://gerrit.omnirom.org/#/c/5011/
TelephonyProvider: https://gerrit.omnirom.org/#/c/5012/
Telephony: https://gerrit.omnirom.org/#/c/5010/

Change-Id: Ic5a59be11f76b4a9eba075d9c3525086b3ee389e