Frameworks Base: Mock SMS (1/4)

This change brings the possibility of simulate the reception of SMS on real devices.
This change includes the setting and security permission.

Ported from http://review.cyanogenmod.org/#/c/23017

Patchset 2: Rebased

Change-Id: I535d5e69fbd9d612f7ed1a635032be7caefeda04
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>
Active display: Don't show active display if call state is not idle.

This will prevent active display from displaying when a call is
coming in and let the call screen show up instead of active display.

Change-Id: I2cb79e097ae24dc6ad6c8a33be88eb19f7d8d235