dm: MIGRATION: Update migration plan for DM_SPI_FLASH

Migration plan for DM_SPI_FLASH is v2019.07 since it
depends on DM_SPI migration.
Signed-off-by: NJagan Teki <jagan@amarulasolutions.com>

Makefile

@@ -964,6 +964,16 @@ ifneq ($(CONFIG_DM_SPI)$(CONFIG_OF_CONTROL),yy)
 	@echo >&2 "See doc/driver-model/MIGRATION.txt for more info."
 	@echo >&2 "===================================================="
 endif
+endif
+ifeq ($(CONFIG_SPI_FLASH),y)
+ifneq ($(CONFIG_DM_SPI_FLASH)$(CONFIG_OF_CONTROL),yy)
+	@echo >&2 "===================== WARNING ======================"
+	@echo >&2 "This board does not use CONFIG_DM_SPI_FLASH. Please update"
+	@echo >&2 "the board to use CONFIG_SPI_FLASH 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.txt for more info."
+	@echo >&2 "===================================================="
+endif
 endif
 	@# Check that this build does not use CONFIG options that we do not
 	@# know about unless they are in Kconfig. All the existing CONFIG