jf-common: only build selinux in kernel if we want it

Change-Id: I11800c2432cc98e89858d971126b4a5db1d1ac7b
Merge "jf-common: only build selinux in kernel if we want it" into cm-10.1
Merge branch 'cm-10.1' of github.com:CyanogenMod/android_device_samsung_jf-common into cm-10.1