shields: x_nucleo_iks01a1: Enable IRQ pin for LIS3MDL magn sensor

Update shield description and sample to allow testing of LIS3MDL
sensor IRQ pin.

Update sample yaml file to state dependency on arduino_gpio.
Additionally, fix redundant line in sample yaml

Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
4 files changed