driver/counter: Add support for Microchip's XEC basic timer devices

Such basic timer is found on MEC150x for instance.
Since instances have dedicated data, let's define specifice instance
based on unique DT base address definition.

Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
Signed-off-by: Daniel Leung <daniel.leung@intel.com>