Enable heap memory on stm32w.
Add functions stm32w_radio_deinit() and stm32w_radio_off_force() to disable the radio during deep sleep.
Added low power mode LPM2 to energest.
Output LPM2 value.
Add average current to output.
Add some raw energest values to output.
Adapted er-rest-example project config for stm32w.
Add function clock_adjust_ticks() to stm32.
Add  dummy version of rtimer_arch_sleep() for stm32w.
Enable energest for stm32w.