N7100: Enable Custom Hardware Button Mapping Support

Change-Id: I8cfb081e64a0d690a3decdaea9e7d5457b3d1ea2
N7100: Device info

Device info: https://gerrit.omnirom.org/#/c/2814/

Change-Id: I787ad73afe84451576fafc5edfaf57e21f7d4465