Both ixp4xx and cns3xxx targets support RFKILL in the kernel.
Also add a RFKILL_GPIO default for kernel config
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@33831 3c298f89-4303-0410-b956-a3cf2f4a3e73