m4: fix OTG mountpoint in fstab

vold complains:
E/DirectVolume( 234): Vold managed volumes must have auto mount point;
ignoring /storage/usbdisk

Caused by fstab format change between 4.3 and 4.4. Boot tested only, I
don't have any OTG equipment.
m4: fix diag permissions in ueventd config
m4: cleanup deprecated property syntax in init script
Merge pull request #4 from u-ra/cm-11.0