Makefile: Use common code for DM_VIDEO deprecation warning

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

Tested with pxm2

Old message:

===================== WARNING ======================
This board does not use CONFIG_DM_VIDEO Please update
the board to use CONFIG_DM_VIDEO 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_DM_VIDEO (Driver Model
for video). Please update the board to use
CONFIG_DM_VIDEO 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 d1a9b3e..0c2f0ab 100644
--- a/Makefile
+++ b/Makefile
@@ -1094,16 +1094,8 @@
 		$(CONFIG_MVSATA_IDE))
 	$(call deprecated,CONFIG_AHCI,AHCI,v2019.07, $(CONFIG_LIBATA))
 	$(call deprecated,CONFIG_DM_PCI,PCI,v2019.07,$(CONFIG_PCI))
-ifneq ($(CONFIG_LCD)$(CONFIG_VIDEO),)
-ifneq ($(CONFIG_DM_VIDEO),y)
-	@echo >&2 "===================== WARNING ======================"
-	@echo >&2 "This board does not use CONFIG_DM_VIDEO Please update"
-	@echo >&2 "the board to use CONFIG_DM_VIDEO 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_DM_VIDEO,video,v2019.07,\
+		$(CONFIG_LCD)$(CONFIG_VIDEO))
 ifeq ($(CONFIG_SPI_FLASH),y)
 ifneq ($(CONFIG_DM_SPI_FLASH)$(CONFIG_OF_CONTROL),yy)
 	@echo >&2 "===================== WARNING ======================"