A set of EFI fixes:

 - Enforce NX on RO data in mixed EFI mode
 - Destroy workqueue in an error handling path to prevent UAF
 - Stop argument parser at '--' which is the delimiter for init
 - Treat a NULL command line pointer as empty instead of dereferncing it
   unconditionally.
 - Handle an unterminated command line correctly
 - Cleanup the 32bit code leftovers and remove obsolete documentation
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