Peregrine: Remove vfat restriction

     * This locks out other formats from mounting
     * Better alternative for http://review.cyanogenmod.org/#/c/73412/
PS2: * Remove mistaken /external_sd entry
     * defaults instead of default

Change-Id: I3a00e1a8f548acb0ab61bdc382f9422bdc5bd981
Merge branch 'cm-11.0' of github.com:CyanogenMod/android_device_motorola_peregrine into HEAD