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/freescale/m547xevb/m547xevb.c b/board/freescale/m547xevb/m547xevb.c
index 9e1aa99..e8d8611 100644
--- a/board/freescale/m547xevb/m547xevb.c
+++ b/board/freescale/m547xevb/m547xevb.c
@@ -9,6 +9,7 @@
 
 #include <config.h>
 #include <common.h>
+#include <init.h>
 #include <pci.h>
 #include <asm/immap.h>
 #include <asm/io.h>