efi(4): Move error macros to efi.h.PR kern/57076XXX pullup-10
branches: 1.2.4;efi(9): Set correct calling convention for EFI runtime services.No functional change intended -- this only affects x86, whichcurrently doesn't support EFI runtime services.
machine/efi.h: Migrate common definitions to dev/efi/efi.h.