soc: arm: nxp: kinetis: ke1xf: enable lptmr as timer
soc: arm: nxp: kinetis: ke1xf: enable lptmr as timer

Enable the NXP Kinetis Low Power Timer (LPTMR) OS timer driver when
power management is enabled as the Arm SysTick timer cannot wake up the
KE1xF from deep sleep.

Signed-off-by: Henrik Brix Andersen <24a3f13c22635bab658e39fc5f1e63c575328aae@vestas.com>

zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,finikorg/zephyr,finikorg/zephyr,galak/zephyr,galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,galak/zephyr,zephyrproject-rtos/zephyr