PPC: update openbios firmware

There were some changes upstream to account for broken usage of mtmsr, so
before applying the mtmsr patch we need to update OpenBIOS, otherwise the
PPC target would break.

Signed-off-by: Alexander Graf <agraf@suse.de>

pc-bios/README

@@ -10,8 +10,10 @@
 - OpenBIOS (http://www.openbios.org/) is a free (GPL v2) portable
   firmware implementation. The goal is to implement a 100% IEEE
   1275-1994 (referred to as Open Firmware) compliant firmware.
-  The included image for PowerPC (for 32 and 64 bit PPC CPUs), Sparc32
-  and Sparc64 are built from OpenBIOS SVN revision 1018.
+  The included image for PowerPC (for 32 and 64 bit PPC CPUs),
+
+  PowerPC is built from OpenBIOS SVN revision 1044
+  Sparc32 and Sparc64 are built from OpenBIOS SVN revision 1018.
 
 - SLOF (Slimline Open Firmware) is a free IEEE 1275 Open Firmware
   implementation for certain IBM POWER hardware.  The sources are at