imx: pico-imx8mq: switch to use binman

Switch to use binman to pack images

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Patrick Wildt <patrick@blueri.se>
diff --git a/configs/pico-imx8mq_defconfig b/configs/pico-imx8mq_defconfig
index 4195370..e1bed34 100644
--- a/configs/pico-imx8mq_defconfig
+++ b/configs/pico-imx8mq_defconfig
@@ -23,7 +23,7 @@
 CONFIG_FIT=y
 CONFIG_FIT_EXTERNAL_OFFSET=0x3000
 CONFIG_SPL_LOAD_FIT=y
-CONFIG_SPL_FIT_GENERATOR="arch/arm/mach-imx/mkimage_fit_atf.sh"
+# CONFIG_USE_SPL_FIT_GENERATOR is not set
 CONFIG_BOARD_EARLY_INIT_F=y
 CONFIG_BOARD_LATE_INIT=y
 CONFIG_SPL_BOARD_INIT=y