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

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

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/ram/rockchip/dmc-rk3368.c b/drivers/ram/rockchip/dmc-rk3368.c
index 5279bf0..42114a5 100644
--- a/drivers/ram/rockchip/dmc-rk3368.c
+++ b/drivers/ram/rockchip/dmc-rk3368.c
@@ -3,7 +3,7 @@
  * (C) Copyright 2017 Theobroma Systems Design und Consulting GmbH
  */
 
-#include <common.h>
+#include <config.h>
 #include <clk.h>
 #include <dm.h>
 #include <hang.h>