- periph_conf_common.h contains peripherals configuration common to all mkr boards
- periph_conf.h is specific to a subset of mkr boards (mkr1000 and mkrzero)
The currently supported SAM0 MCUs (samd21, saml21, saml1x) share the same
Timer peripheral, yet each of them carries it's own copy of the Timer
driver.
This introduces a new timer driver that is common for all sam0 MCUs and
uses structs for configuration instead of defines.