spl: dm: Kconfig: SPL_RAM depends on SPL_DM

This commit models the dependency from SPL_RAM to SPL_DM in Kconfig.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/ram/Kconfig b/drivers/ram/Kconfig
index 61afd7a..e75c23f 100644
--- a/drivers/ram/Kconfig
+++ b/drivers/ram/Kconfig
@@ -10,7 +10,7 @@
 
 config SPL_RAM
 	bool "Enable RAM support in SPL"
-	depends on RAM
+	depends on RAM && SPL_DM
 	help
 	  The RAM subsystem adds a small amount of overhead to the image.
 	  If this is acceptable and you have a need to use RAM drivers in