ARM: imx_v6_v7_defconfig: Enable wireless support

Wandboard has a Broadcom 4329 chipset connected to SDHC, so turn on the wireless
related options.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Tested-by: Tony Prisk <linux@prisktech.co.nz>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>