flo: set config_deviceHardwareKeys properly

allow for soft menu key with this commit: http://review.cyanogenmod.org/#/c/48155/

Change-Id: Id14d7613b9ee7bc58cde7b3413c2c42a13eda8a9
Use CM defconfig

Change-Id: I0d040666c5b22959e2514d51e33e9d7fb514493d
Merge branch 'cm-10.2' of https://github.com/CyanogenMod/android_device_asus_flo into DJL10.2