Kill virtual address randomization for the EFI runtime. It was a neat idea

Kill virtual address randomization for the EFI runtime.  It was a neat idea
but it appears to be too fragile and now that we are using a 48-bit VA space
for the EFI runtime we no longer need to call SetVirtualAddressMap() to
make address fit into our pmap.  Unbreaks the x13s.

ok mlarkin@, patrick@