samples: shields: x_nucleo_iks01a2: Depend on arduino_gpio
samples: shields: x_nucleo_iks01a2: Depend on arduino_gpio

There are build issues with this sample now that it requires that the
board dts have an arduino_header node.  Add depends_on: arduino_gpio
to sample.yaml so we only build this if the board has that header.

Also remove a duplicate line for excluding the disco_l475_iot1 platform.

Signed-off-by: Kumar Gala <a5e5248af4cd4f0ed8c515f61d40a6e2db46a66e@linaro.org>

Vudentz/zephyr,Vudentz/zephyr,finikorg/zephyr,finikorg/zephyr,galak/zephyr,nashif/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,nashif/zephyr,galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,nashif/zephyr,nashif/zephyr,galak/zephyr,Vudentz/zephyr,Vudentz/zephyr,Vudentz/zephyr,Vudentz/zephyr