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/mpc8349itx/pci.c b/board/freescale/mpc8349itx/pci.c
index c3c2328..550a2af 100644
--- a/board/freescale/mpc8349itx/pci.c
+++ b/board/freescale/mpc8349itx/pci.c
@@ -4,6 +4,7 @@
  */
 
 #include <common.h>
+#include <init.h>
 
 #include <asm/mmu.h>
 #include <asm/io.h>