kernel: ifb: set default numifbs to 0

By default on module load, 2 ifb interfaces are created and typically
remain unused, cluttering 'ip link' outputs and generally confusing
things.  sqm-scripts for example, creates its own ifb interface/s
instead of using these 2 defaults ifbs.

Tell the ifb module to not create any default ifbs on load via the
numifbs parameter.

Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>

package/kernel/linux/modules/netdevices.mk

@@ -927,6 +927,7 @@ define KernelPackage/ifb
 	CONFIG_NET_CLS=y
   FILES:=$(LINUX_DIR)/drivers/net/ifb.ko
   AUTOLOAD:=$(call AutoLoad,34,ifb)
+  MODPARAMS.ifb:=numifbs=0
 endef
 
 define KernelPackage/ifb/description