ti: am654: Drop duplicate dm.h inclusion

We only need to include this header once. Drop the duplicate.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/ram/k3-am654-ddrss.c b/drivers/ram/k3-am654-ddrss.c
index 8bbd8cf..21e5a65 100644
--- a/drivers/ram/k3-am654-ddrss.c
+++ b/drivers/ram/k3-am654-ddrss.c
@@ -13,7 +13,6 @@
 #include <ram.h>
 #include <asm/io.h>
 #include <power-domain.h>
-#include <dm.h>
 #include <asm/arch/sys_proto.h>
 #include <dm/device_compat.h>
 #include <power/regulator.h>