prep: Include devices for ppc64 as well

Allows running qemu-system-ppc64 -M prep for consistency.

Reported-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Andreas Färber <andreas.faerber@web.de>
Acked-by: Hervé Poussineau <hpoussineau@reactos.org>

default-configs/ppc64-softmmu.mak

@@ -12,9 +12,12 @@ CONFIG_I8254=y
 CONFIG_PCKBD=y
 CONFIG_FDC=y
 CONFIG_DMA=y
+CONFIG_I82374=y
 CONFIG_OPENPIC=y
 CONFIG_PREP_PCI=y
+CONFIG_I82378=y
 CONFIG_MACIO=y
+CONFIG_PCSPK=y
 CONFIG_CUDA=y
 CONFIG_ADB=y
 CONFIG_MAC_NVRAM=y