Disable /dev/kmem

A previous patch erronously removed this line form the FP2 kernel
cofig. Re-add it.

Fixes up I58dbfa9ca7e433492a3c4bddaf5f2cae2e9b0755

FPIIM-109
FPIIM-56

Change-Id: I43d8dad2e6066047276c17ae32579289a56d6b41
1 file changed