board: elgin: Remove <common.h> and add needed includes

Remove <common.h> from this board vendor directory and when needed
add missing include files directly.

Signed-off-by: Tom Rini <trini@konsulko.com>

board/elgin/elgin_rv1108/elgin_rv1108.c

@@ -4,7 +4,6 @@
  * Authors: Andy Yan <andy.yan@rock-chips.com>
  */
 
-#include <common.h>
 #include <init.h>
 #include <syscon.h>
 #include <asm/global_data.h>