arm: fsl: imx6ulz_bsh_smm_m2: Migrate to OF_UPSTREAM

Migrate imx6ulz_bsh_smm_m2 board to OF_UPSTREAM.

Signed-off-by: Patrick Barsanti <patrick.barsanti@amarulasolutions.com>
diff --git a/arch/arm/mach-imx/mx6/Kconfig b/arch/arm/mach-imx/mx6/Kconfig
index 15ee2b9..7800553 100644
--- a/arch/arm/mach-imx/mx6/Kconfig
+++ b/arch/arm/mach-imx/mx6/Kconfig
@@ -481,6 +481,7 @@
 	select DM_MTD
 	select DM_THERMAL
 	select SUPPORT_SPL
+	imply OF_UPSTREAM
 
 config TARGET_MYS_6ULX
 	bool "MYiR MYS-6ULX"