[PATCH] kbuild: add ia64 support to rpm Makefile target

On ia64, only the EFI (fat) partition is available to boot from.  The rpm
needs to install the kernel under /boot/efi to be useable on ia64.

Signed-off-by: Greg Edwards <edwardsg@sgi.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>