imx8: Add DEK blob encapsulation

Add DEK encapsulation support for imx8. The DEK blob is generated by the
SECO through the SCFW API.

Signed-off-by: Clement Faure <clement.faure@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/arch/arm/mach-imx/imx8/Kconfig b/arch/arm/mach-imx/imx8/Kconfig
index 04b9729..4e76612 100644
--- a/arch/arm/mach-imx/imx8/Kconfig
+++ b/arch/arm/mach-imx/imx8/Kconfig
@@ -2,6 +2,7 @@
 
 config AHAB_BOOT
 	bool "Support i.MX8 AHAB features"
+	imply CMD_DEKBLOB
 	help
 	  This option enables the support for AHAB secure boot.