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

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

Reviewed-by: Sean Anderson <seanga2@gmail.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/board/sipeed/maix/maix.c b/board/sipeed/maix/maix.c
index 06653b5..08077a1 100644
--- a/board/sipeed/maix/maix.c
+++ b/board/sipeed/maix/maix.c
@@ -3,7 +3,7 @@
  * Copyright (C) 2019-20 Sean Anderson <seanga2@gmail.com>
  */
 
-#include <common.h>
+#include <config.h>
 #include <clk.h>
 #include <dm.h>
 #include <fdt_support.h>