pseries: Update SLOF firmware image

This fixes USB host bus adapter name in the device tree to match QEMU's
one.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
diff --git a/pc-bios/README b/pc-bios/README
index ad78f6d..0b0b5d4 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/aik/SLOF, and the image currently in qemu is
-  built from git tag qemu-slof-20190827.
+  built from git tag qemu-slof-20190911.
 
 - 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 a3a3e49..2af0c5d 100644
--- a/pc-bios/slof.bin
+++ b/pc-bios/slof.bin
Binary files differ
diff --git a/roms/SLOF b/roms/SLOF
index ea22160..bcc3c4e 160000
--- a/roms/SLOF
+++ b/roms/SLOF
@@ -1 +1 @@
-Subproject commit ea221600a116883137ef90b2b7ab7d2472bc4f10
+Subproject commit bcc3c4e5c21a015f4680894c4ec978a90d4a2d69