common: Move pci_init_board() out of common.h

This function can be dropped when all boards use driver model for PCI. For
now, move it into init.h with a comment.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/board/renesas/r7780mp/r7780mp.c b/board/renesas/r7780mp/r7780mp.c
index e2c5c5b..8dbeeb6 100644
--- a/board/renesas/r7780mp/r7780mp.c
+++ b/board/renesas/r7780mp/r7780mp.c
@@ -6,6 +6,7 @@
 
 #include <common.h>
 #include <ide.h>
+#include <init.h>
 #include <asm/processor.h>
 #include <asm/io.h>
 #include <asm/pci.h>