jf-common: mount persdata in fstab

i also corrected 'default' to 'defaults' on the vold mounts while updating fstab

someone should probably advise the best mount flags for this partition.  i just copied verbatim from init.carrier.rc.

Change-Id: I8f3825e96c0e3239c40e00f5dee7b49ddb59c821
jf-common: init.qcom.rc: remove redundant large_tcp_window_size stuff

Change-Id: Iee0fa3bc9ec85d2bce3e1b0b159797bdde353586