prep: Update ppc_rom.bin

This increases file size from 512 KiB to 1 MiB.

Signed-off-by: Andreas Färber <andreas.faerber@web.de>
raven: Move BIOS loading from board code to PCI host

Raven datasheet explains where firmware lives in system memory, so do
it there instead of in board code. Other boards using the same PCI
host will not have to copy the firmware loading code.

Signed-off-by: Hervé Poussineau <hpoussin@reactos.org>
[AF: Drop BIOS size workaround in favor of replacing our firmware blob]
Signed-off-by: Andreas Färber <andreas.faerber@web.de>
Merge remote-tracking branch 'remotes/afaerber/tags/prep-for-2.0' into staging

PReP machine and devices

* ppc_rom.bin update
* Raven PCI host bridge preparations for OpenBIOS

# gpg: Signature made Thu 13 Mar 2014 19:28:37 GMT using RSA key ID 3E7E013F
# gpg: Good signature from "Andreas Färber <afaerber@suse.de>"
# gpg:                 aka "Andreas Färber <afaerber@suse.com>"

* remotes/afaerber/tags/prep-for-2.0:
  raven: Move BIOS loading from board code to PCI host
  prep: Update ppc_rom.bin

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>