counter: ftm-quaddec: Depend on the Layerscape SoC

At the moment only the Freescale LS1021A is the only HW that
supports this IP block so add an appropriate dependency and
compile test.

Signed-off-by: Peter Robinson <pbrobinson@gmail.com>
Link: https://lore.kernel.org/r/20230108074750.443705-3-pbrobinson@gmail.com/


Signed-off-by: William Breathitt Gray <william.gray@linaro.org>