m7: Update kernel dependency

Change-Id: Ia517e05beb8553833ece61dc6c179fb0539d87a2
m7: move some BoardConfig defines to m7-common

Change-Id: I947ad1d81b96a0e630711a8cf11815169b8b7b13
m7: Change inherit order

 * Move comon_full_phone.mk to top. Otherwise default notification
   and alarm tone will be completely wrong

Please see the following changes for an explanation/source:

http://review.cyanogenmod.org/#/c/59655/
http://review.cyanogenmod.org/#/c/59973/

Change-Id: Idf0e759a941192056ad44cd8c0f540126fea8377