mako: Enable mounting of connected USB storage devices

https://github.com/CyanogenMod/android_device_asus_flo/commit/b9b1f770c1d2a7ea9106c901f3f1eac3e3f735a2

Change-Id: Ib63613577a7eb7a326807bc0f7768459fe91a4a1
fstab: add noauto_de_alloc to /cache