[nps] ups, add missing nps_electrical files
TELEMETRY_FREQUENCY defaults to PERIODIC_FREQUENCY

also default to 60Hz if PERIODIC_FREQUENCY is not configured
Merge branch 'master' into baro_abi

get fixes from master:
  TELEMETRY_FREQUENCY defaults to PERIODIC_FREQUENCY or 60Hz
  [nps] ups, add missing nps_electrical files