pc-bios: Update OpenBIOS images

Update OpenBIOS images to r1060 built from submodule.
Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>

pc-bios/README

@@ -12,7 +12,7 @@
   1275-1994 (referred to as Open Firmware) compliant firmware.
   The included images for PowerPC (for 32 and 64 bit PPC CPUs),
   Sparc32 and Sparc64 are built from OpenBIOS SVN revision
-  1056.
+  1060.
 
 - SLOF (Slimline Open Firmware) is a free IEEE 1275 Open Firmware
   implementation for certain IBM POWER hardware.  The sources are at

openbios @ d1d2787f

-Subproject commit ff61d973e5a4a68b29e485b3f88e6a2d1d96cf45
+Subproject commit d1d2787f87167edf487a60e61b9168514d5a7434