jf-common: fstab flags, read ahead cache size

Change-Id: I80a45d5349bf0c095bda2da8c1ba64aedcf7ee0b
jf-common: fix restorecon /efs

restorecon -R is not valid in init.rc

restorecon_recursive is valid with this: http://review.cyanogenmod.org/#/c/58526/

Change-Id: I3bdbb7c7d8b07f9cd7afb1ed59f2c1d9191a2efd
jf-common: Change rtc0 to 660

Like just about every other device I looked at

Change-Id: Iae7f9b5054a435c39b4be09527aaa92682d806cc