Makefile: Use common code for LIBATA deprecation warning

Update the CONFIG_LIBATA check to use the 'deprecated' function.

Tested with MPC8349ITX

Old message:

===================== WARNING ======================
This board does use CONFIG_LIBATA but has CONFIG_AHCI not
enabled. Please update the storage controller driver to use
CONFIG_AHCI before the v2019.07 release.
Failure to update by the deadline may result in board removal.
See doc/driver-model/migration.rst for more info.
====================================================

New message:

===================== WARNING ======================
This board does not use CONFIG_AHCI (Driver Model
for AHCI). Please update the board to use
CONFIG_AHCI before the v2019.07 release. Failure to
update by the deadline may result in board removal.
See doc/driver-model/migration.rst for more info.
====================================================

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/Makefile b/Makefile
index d650a99..8d275da 100644
--- a/Makefile
+++ b/Makefile
@@ -1092,17 +1092,7 @@
 		USB,v2019.07,$(CONFIG_USB))
 	$(call deprecated,CONFIG_AHCI,AHCI instead of CONFIG_MVSATA_IDE,v2019.07, \
 		$(CONFIG_MVSATA_IDE))
-ifeq ($(CONFIG_LIBATA),y)
-ifneq ($(CONFIG_AHCI),y)
-	@echo >&2 "===================== WARNING ======================"
-	@echo >&2 "This board does use CONFIG_LIBATA but has CONFIG_AHCI not"
-	@echo >&2 "enabled. Please update the storage controller driver to use"
-	@echo >&2 "CONFIG_AHCI before the v2019.07 release."
-	@echo >&2 "Failure to update by the deadline may result in board removal."
-	@echo >&2 "See doc/driver-model/migration.rst for more info."
-	@echo >&2 "===================================================="
-endif
-endif
+	$(call deprecated,CONFIG_AHCI,AHCI,v2019.07, $(CONFIG_LIBATA))
 ifeq ($(CONFIG_PCI),y)
 ifneq ($(CONFIG_DM_PCI),y)
 	@echo >&2 "===================== WARNING ======================"