kbuild: clean up rule_dtc_dt_yaml

Commit 3a2429e1 ("kbuild: change if_changed_rule for multi-line
recipe") and commit 4f0e3a57 ("kbuild: Add support for DT binding
schema checks") came in via different sub-systems.

This is a follow-up cleanup.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

scripts/Makefile.lib

@@ -305,8 +305,8 @@ quiet_cmd_dtb_check =	CHECK   $@
       cmd_dtb_check =	$(DT_CHECKER) -p $(DT_TMP_SCHEMA) $@ ;
 
 define rule_dtc_dt_yaml
-	$(call cmd_and_fixdep,dtc,yaml)		\
-	$(call echo-cmd,dtb_check) $(cmd_dtb_check)
+	$(call cmd_and_fixdep,dtc,yaml)
+	$(call cmd,dtb_check)
 endef
 
 $(obj)/%.dt.yaml: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE