lantiq: kernel 5.10: disable ltq-deu

For linux 5.10, kmod-ltq-deu need to be migrated to the new crypto
API/framework.

Leave it in tree for now and enable it only for Kernel 5.4. Maybe
someone picks up the work to migrate the package.

Signed-off-by: Mathias Kresin <dev@kresin.me>

package/kernel/lantiq/ltq-deu/Makefile

@@ -21,7 +21,7 @@ define KernelPackage/ltq-deu-template
   TITLE:=deu driver for $(1)
   URL:=http://www.lantiq.com/
   VARIANT:=$(1)
-  DEPENDS:=@TARGET_lantiq_$(2) +kmod-crypto-manager
+  DEPENDS:=@TARGET_lantiq_$(2) +kmod-crypto-manager @LINUX_5_4
   FILES:=$(PKG_BUILD_DIR)/ltq_deu_$(1).ko
   AUTOLOAD:=$(call AutoProbe,ltq_deu_$(1))
 endef