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/sdram_rk3288.c b/drivers/ram/rockchip/sdram_rk3288.c
index 242d564..c9f61e9 100644
--- a/drivers/ram/rockchip/sdram_rk3288.c
+++ b/drivers/ram/rockchip/sdram_rk3288.c
@@ -6,7 +6,7 @@
  * Adapted from coreboot.
  */
 
-#include <common.h>
+#include <config.h>
 #include <clk.h>
 #include <dm.h>
 #include <dt-structs.h>