ARM: dts: n900: use iio driver for accelerometer

The accelerometer in the N900 is supported by the iio-framework since commit
8a7449d6

 ("iio: accel: add support for LIS302DL variant). This commit
switches to it and updates node properties to match the bindings of the new
compatible.

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Sicelo A. Mhlongo <absicsz@gmail.com>
Message-Id: <20221229171348.3543327-3-absicsz@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>