linux-wrs: pass netfilter options as an addon feature

Fixes [BUGID #199]

Although an optional feature to a base BSP, most of the machines
currently supported want/need the netfilter options. To enforce
this configuration, it is temporarily forced in the kernel
recipe itself, but can move to machine configurations in the
future.

Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>

meta/recipes-kernel/linux/linux-wrs_git.bb

@@ -35,6 +35,7 @@ B = "${WORKDIR}/linux-${WRMACHINE}-${LINUX_KERNEL_TYPE}-build"
 
 # functionality flags
 force_revisions = "t"
+KERNEL_FEATURES=features/netfilter
 
 do_patch() {
 	cd ${S}