[lkrnprefix] Make real-mode setup code relocatable

The bzImage boot protocol allows the real-mode code to be loaded at
any segment within base memory.  (The fact that both iPXE and recent
versions of Syslinux will load the real-mode code at 1000:0000 is a
coincidence; it is not guaranteed by the specification.)

Fix by making the code relocatable.

Reported-by: Andrew Stuart <andrew@shopcusa.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>