pseries: Update SLOF for NVRAM support

Now that we have implemented PAPR compatible NVRAM interfaces in qemu, this
updates the SLOF firmware to actually initialize and use the NVRAM as a
PAPR guest firmware is expected to do.

This SLOF update also includes an ugly but useful workaround for a bug in
the SLES11 installer which caused it to fail under KVM.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>

pc-bios/README

@@ -17,7 +17,7 @@
 - SLOF (Slimline Open Firmware) is a free IEEE 1275 Open Firmware
   implementation for certain IBM POWER hardware.  The sources are at
   https://github.com/dgibson/SLOF, and the image currently in qemu is
-  built from git tag qemu-slof-20120731.
+  built from git tag qemu-slof-20121018.
 
 - sgabios (the Serial Graphics Adapter option ROM) provides a means for
   legacy x86 software to communicate with an attached serial console as