x86, efi: Add infrastructure for UEFI 2.0 runtime services

We're currently missing support for any of the runtime service calls
introduced with the UEFI 2.0 spec in 2006. Add the infrastructure for
supporting them.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Link: http://lkml.kernel.org/r/1307388985-7852-2-git-send-email-mjg@redhat.com


Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>