board: phytec: imx8mm-phycore: Switch to binman

Use binman for image creation.

Signed-off-by: Teresa Remmet <t.remmet@phytec.de>
diff --git a/arch/arm/mach-imx/imx8m/Kconfig b/arch/arm/mach-imx/imx8m/Kconfig
index c68053b..276b8bd 100644
--- a/arch/arm/mach-imx/imx8m/Kconfig
+++ b/arch/arm/mach-imx/imx8m/Kconfig
@@ -129,6 +129,7 @@
 
 config TARGET_PHYCORE_IMX8MM
 	bool "PHYTEC PHYCORE i.MX8MM"
+	select BINMAN
 	select IMX8MM
 	select SUPPORT_SPL
 	select IMX8M_LPDDR4