[lib][mincrypt] move the mincrypt headers in a level to match the module name
[lib][bootimage] first stab at device side bootimage processing

Add lib/bootimage to parse in memory copies of bootimages
Add a few command line arguments to mkimage
[app][lkboot] add code to create/remove additional partitions, try to boot bootimages if passed
[arm] add ability to pass and generically read up to 4 boot args from whoever loaded lk

-Extend arch_chain_load() to pass 4 args