configs: colibri-imx7: set non-secure boot mode as default

Linux kernel is supposed to run in non-secure world,
fix the defconfig accordingly.

Signed-off-by: Emanuele Ghidoli <emanuele.ghidoli@toradex.com>
diff --git a/configs/colibri_imx7_emmc_defconfig b/configs/colibri_imx7_emmc_defconfig
index 9d4423c..8dd9fe6 100644
--- a/configs/colibri_imx7_emmc_defconfig
+++ b/configs/colibri_imx7_emmc_defconfig
@@ -8,7 +8,6 @@
 CONFIG_TARGET_COLIBRI_IMX7=y
 CONFIG_TARGET_COLIBRI_IMX7_EMMC=y
 CONFIG_OF_LIBFDT_OVERLAY=y
-CONFIG_ARMV7_BOOT_SEC_DEFAULT=y
 CONFIG_IMX_RDC=y
 CONFIG_IMX_BOOTAUX=y
 CONFIG_IMX_HAB=y