drivers: counter: Add Smartbond basic support

This adds support for the TIMER1-4 counter.
Each counter has 24bits and can run on LP_CLK (15-32KHz)
or DIVN clock (32MHz) with prescaler 1-32.
Each counter can have one alarm set.

Signed-off-by: Jerzy Kasenberg <jerzy.kasenberg@codecoup.pl>
7 files changed