Add patches for ramdiskaddr, second and dtb
Patch mkbootimg:
- revert *_offset switches to *addr
- show all command switches in help

Patch unpackbootimg:
- hide Android magic message if no issues
- display ramdisk_addr always, second_addr and/or dt_size if they exist, and export them out to file
- add support to split out second stage and/or dtb if they exist