pseries: Update SLOF firmware image

This patch updates the SLOF firmware image used on the pseries
machine.  The new version adds support for Cirrus VGA and virtfs, as
well as including a number of bugfixes.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>
diff --git a/pc-bios/README b/pc-bios/README
index 5dce355..71f4871 100644
--- a/pc-bios/README
+++ b/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-20120111.1.
+  built from git tag qemu-slof-20120217.
 
 - sgabios (the Serial Graphics Adapter option ROM) provides a means for
   legacy x86 software to communicate with an attached serial console as
diff --git a/pc-bios/slof.bin b/pc-bios/slof.bin
index 8554f54..449a7bb 100644
--- a/pc-bios/slof.bin
+++ b/pc-bios/slof.bin
Binary files differ
diff --git a/roms/SLOF b/roms/SLOF
index ab062ff..d153364 160000
--- a/roms/SLOF
+++ b/roms/SLOF
@@ -1 +1 @@
-Subproject commit ab062ff3b37c39649f2b0d94ed607adc6f6b3c7d
+Subproject commit d153364253548d6cd91403711f84996e6a7dab31