kernel: change dependency of kmod-ebtables-* on kmod-ebtables to selecting

Non-selecting dependencies easily lead to Kconfig failures due to recursive
dependencies. We hit such an issue in Gluon; the easiest fix is to make
the dependency selecting.

Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>

package/kernel/linux/modules/netfilter.mk

@@ -784,7 +784,7 @@ $(eval $(call KernelPackage,ebtables))
 
 define AddDepends/ebtables
   SUBMENU:=$(NF_MENU)
-  DEPENDS+=kmod-ebtables $(1)
+  DEPENDS+= +kmod-ebtables $(1)
 endef