pseries: Update SLOF firmware image

This is mostly compiler warnings fixed but while doing this,
a bug in MIN() in tcgbios was found.

Alexey Kardashevskiy (14):
      helpers: Define MIN()
      libc: Compile with -Wextra
      elf: Compile with -Wextra
      usb: Compile with -Wextra
      veth: Compile with -Wextra
      virtio: Compile with -Wextra
      e1000: Compile with -Wextra
      libnet: Compile with -Wextra
      libhv: Compile with -Wextra
      libnvram: Compile with -Wextra
      libtpm: Compile with -Wextra
      slof/prim: Compile with -Wextra
      Makefile: Actually compile with -Wextra
      version: update to 20210217

Thomas Huth (1):
      virtio-serial: Remove superfluous serial-* words

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 db7129e..c101c9a 100644
--- a/pc-bios/README
+++ b/pc-bios/README
@@ -14,7 +14,7 @@
 - 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-20200717.
+  built from git tag qemu-slof-20210217.
 
 - 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 448dcad..3f3918a 100644
--- a/pc-bios/slof.bin
+++ b/pc-bios/slof.bin
Binary files differ
diff --git a/roms/SLOF b/roms/SLOF
index e18ddad..33a7322 160000
--- a/roms/SLOF
+++ b/roms/SLOF
@@ -1 +1 @@
-Subproject commit e18ddad8516ff2cfe36ec130200318f7251aa78c
+Subproject commit 33a7322de13e9dca4b38851a345a58d37e7a441d