SoundSettings: Assigning a null to an unnecessary variable

Change-Id: Ic8c3e6ff66cc888f6069e3bbef666ede3c56dc13
settings: Add blacklist provider permission

Change-Id: I1778451f0e6a42b9734e6482ebdf826874c1100d
JIRA: CYAN-3727
Issue: https://jira.cyanogenmod.org/browse/CYAN-3727
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>
Settings: Mock SMS (3/4)

This change brings the possibility of simulate the reception of SMS on real devices.
This change includes the settings to enable/disable the mock SMS feature.

Ported from http://review.cyanogenmod.org/#/c/23018

Change-Id: I8818995147c41db261d9c9506c1741ed99ef581e
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>