[2/2]Settings: Option to hide Adb notification icon

Base: https://gerrit.omnirom.org/#/c/2934/

Change-Id: I3ac5f08a077e04dade4bdeed58442043a8fb5d23

Conflicts:
	res/values/custom_strings.xml
Settings: less notification sounds (2/2)

Change-Id: Icd035c06e5955880c73687e5b1407d54b96e1271