The kernel does not support aio with ffs.
Set the property so adb/mtp know to use the compatible
functions, and the same while in recovery.
Bug:
37916658
Test: Use adb / use adb in recovery
Change-Id: Id35a05fcb9952dcf7239bd15a61cc620537419bc
mkdir /dev/usb-ffs/adb 0770 shell shell
mount functionfs adb /dev/usb-ffs/adb uid=2000,gid=2000
write /sys/class/android_usb/android0/f_ffs/aliases adb
+
+ setprop sys.usb.ffs.aio_compat 1
on post-fs-data
chown system system /sys/class/android_usb/android0/f_mass_storage/lun/file