drivers: timer: add NXP LPTMR timer driver

Add NXP Kinetis Low Power Timer (LPTMR) OS timer driver shim. Since the
LPTMR does not support asynchronous changes to the timer period, only
non-tickless mode is supported.

Signed-off-by: Henrik Brix Andersen <hebad@vestas.com>
3 files changed