soc/arm: Add a fixup for counter/alarm sample to compile with MEC1501

There are 2 other timers that could be selected, let's just take the
first 32bits one. This should be sufficient to verify the driver.

Enabling the timer in relevant board's dts file as well.

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