pseries: Update SLOF firmware image

Minor SLOF fixes which are required for libvirtd to function properly:
* vio-vscsi: vscsi-report-luns can return 0
* vio-vscsi: added a proper lun parser
* SLOF: vio-vscsi: fixed bug with reported luns

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Alexander Graf <agraf@suse.de>

pc-bios/README

@@ -16,8 +16,8 @@
 
 - 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-20121018.
+  https://github.com/aik/SLOF, and the image currently in qemu is
+  built from git tag qemu-slof-20130430.
 
 - sgabios (the Serial Graphics Adapter option ROM) provides a means for
   legacy x86 software to communicate with an attached serial console as

roms/SLOF

@@ -1 +1 @@
-Subproject commit 0ad10f26c94a86a0c9c3970e53f9a9f6a744055d
+Subproject commit 8cfdfc43f4c4c8c8dfa4b7cf16f7c19c84eee812