boot: Remove <common.h> and add needed includes

Remove <common.h> from all "boot/" files and when needed add
missing include files directly.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/boot/image-board.c b/boot/image-board.c
index 09b6e4e..b7884b8 100644
--- a/boot/image-board.c
+++ b/boot/image-board.c
@@ -8,7 +8,7 @@
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  */
 
-#include <common.h>
+#include <config.h>
 #include <bootstage.h>
 #include <cpu_func.h>
 #include <display_options.h>