m7-common: Enable Ambient Display

This will make Ambient Display to appears on Settings and works on m7.
Adopted from http://gerrit.aicp-rom.com/#/c/3767/

Change-Id: Icf40351b72b11042d36862bef6c0ad993698c9da
Signed-off-by: Hernán Castañón Álvarez <hernanderes34@gmail.com>