image-type_digi.bbclass: Fix copy of initramfs when Trustfence is disabled.

This commit fixes the copy of the initramfs final image with the extension
*.tf when Trustfence is disabled. This was introduced by commit
5beec04b ("trustfence: Add Trustfence support for CCMX8X")

Signed-off-by: Mike Engel <Mike.Engel@digi.com>

meta-digi-arm/classes/image_types_digi.bbclass

@@ -212,6 +212,9 @@ trustence_sign_cpio() {
 		fi
 		# Sign/encrypt the ramdisk
 		trustfence-sign-kernel.sh -p "${DIGI_FAMILY}" -i "${1}" "${1}.tf"
+	else
+		# Copy the image with no changes
+		cp "${1}" "${1}.tf"
 	fi
 }
 CONVERSIONTYPES += "tf"