PPC: clean up ppc405

Rely on the subpage system instead of the local version.
Make most functions "static".
Fix wrong parameter passed to ppc4xx_pob_reset.

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
diff --git a/hw/ppc.h b/hw/ppc.h
index 4084482..efb09e8 100644
--- a/hw/ppc.h
+++ b/hw/ppc.h
@@ -45,3 +45,5 @@
 #define FW_CFG_PPC_WIDTH	(FW_CFG_ARCH_LOCAL + 0x00)
 #define FW_CFG_PPC_HEIGHT	(FW_CFG_ARCH_LOCAL + 0x01)
 #define FW_CFG_PPC_DEPTH	(FW_CFG_ARCH_LOCAL + 0x02)
+
+#define PPC_SERIAL_MM_BAUDBASE 399193