latona: fixes for the BML to MTD conversion

* Try to mount both /sdcard and /emmc and don't unmount them.
  In this way the zip can be flashed from both the locations
  and recovery can find the zip after the reboot.

* Check the existence of the zip file. This prevents loops in case
  the zip is not found.
init.sh: make sure mountpoints exist

/emmc and /sdcard are only required for the BML to MTD
conversion, create them only when necessary.

/emmc will be removed from the initramfs, hence rmdir /emmc is
no more necessary.

Also, it shouldn't be necessary to keep /emmc and /sdcard mounted,
recovery should mount them automatically if required, but there's
no reason to mount, umount and then mount again the needed block.
latona: fix vold.fstab and storage switch

Use as primary storage the internal memory.
Merge branch 'jellybean' of git://github.com/sconosciuto/android_device_samsung_galaxysl into jellybean