The i.MX 6UL EVK has support for the MAG3110 Magnetometer sensor, included
in its base board by default.

So add support for this Magnetometer in the imx_v6_v7_defconfig.
Signed-off-by: Marco Franchi <marco.franchi@nxp.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>