Revert "[TEMP] Volume button custom actions"

This reverts commit e1d09199b53664c4d69a85345c8df61998c9a57a.

Conflicts:
	res/values/cr_strings.xml

Change-Id: Ib7af3cd75d76e113ffdbb0d438dd26bbf70bcb15

Conflicts:
	res/values/cr_strings.xml
	res/xml/settings_headers.xml