nitrogen6x: defconfig: add CONFIG_USB_G_MULTI

Add USB multifunction gadget as module.

See https://lists.yoctoproject.org/pipermail/meta-freescale/2014-July/thread.html#9610

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
nit6xlite: defconfig: dd CONFIG_USB_G_MULTI=m

Add USB multifunction gadget as module.

See https://lists.yoctoproject.org/pipermail/meta-freescale/2014-July/thread

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>