kernel: unhide kmod-br-netfilter

kmod-br-netfilter is not only a support module, but can be useful on its
own, using the net.bridge.bridge-nf-call-* sysctls.

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

package/kernel/linux/modules/netfilter.mk

@@ -754,7 +754,6 @@ $(eval $(call KernelPackage,arptables))
 define KernelPackage/br-netfilter
   SUBMENU:=$(NF_MENU)
   TITLE:=Bridge netfilter support modules
-  HIDDEN:=1
   DEPENDS:=+kmod-ipt-core
   FILES:=$(LINUX_DIR)/net/bridge/br_netfilter.ko
   KCONFIG:=CONFIG_BRIDGE_NETFILTER