mb/clevo/cml-u: Move hda_verb.c to mainboard's Makefile

Move hda_verb.c from the variant's Makefile to the mainboard's Makefile,
because every variant needs one.

Change-Id: Ia94813f68620abcff48de4fdb117466c91f6863c
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47820
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/mainboard/clevo/cml-u/Makefile.inc b/src/mainboard/clevo/cml-u/Makefile.inc
index 6a388f2..1d9ed2d 100644
--- a/src/mainboard/clevo/cml-u/Makefile.inc
+++ b/src/mainboard/clevo/cml-u/Makefile.inc
@@ -1 +1,2 @@
+ramstage-y += variants/$(VARIANT_DIR)/hda_verb.c
 subdirs-y += variants/$(VARIANT_DIR)
diff --git a/src/mainboard/clevo/cml-u/variants/l140cu/Makefile.inc b/src/mainboard/clevo/cml-u/variants/l140cu/Makefile.inc
index bd3e899..57ad0ca 100644
--- a/src/mainboard/clevo/cml-u/variants/l140cu/Makefile.inc
+++ b/src/mainboard/clevo/cml-u/variants/l140cu/Makefile.inc
@@ -1,5 +1,4 @@
 bootblock-y += bootblock.c
 romstage-y += romstage.c
 ramstage-y += ramstage.c
-ramstage-y += hda_verb.c
 SPD_SOURCES  = samsung-K4AAG165WA-BCTD