galaxy5: overlay cleanup/update

- remove bootloader mode, add download mode to reboot menu
- set datause_iface to pdp0
- remove all ldpi overlay - this should be put in ldpi-common

Change-Id: If57faa01c84b8d38caab8af0d08c6b8fc71e71b5
Merge "galaxy5: overlay cleanup/update" into cm-10.1