imx: cmd_dek: Enable DEK only for chips supporting CAAM

Since cmd_dek is using CAAM JR, so enable the CMD_DEK only when
HAS_CAAM is set

Signed-off-by: Ye Li <ye.li@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig
index 8c00ad1..ca06c1e 100644
--- a/arch/arm/mach-imx/Kconfig
+++ b/arch/arm/mach-imx/Kconfig
@@ -45,7 +45,7 @@
 	bool "Support i.MX HAB features"
 	depends on ARCH_MX7 || ARCH_MX6 || ARCH_MX5 || ARCH_IMX8M
 	select FSL_CAAM if HAS_CAAM
-	imply CMD_DEKBLOB
+	imply CMD_DEKBLOB if HAS_CAAM
 	help
 	  This option enables the support for secure boot (HAB).
 	  See doc/imx/habv4/* for more details.