eeprom: cache the file descriptor instead of fopen/fclose all the time
eeprom: cache the file descriptor instead of fopen/fclose all the time

osmocom/osmo-bts,telenoobie/osmo-bts,geosphere/osmo-bts,geosphere/osmo-bts,shimaore/osmo-bts,shimaore/osmo-bts,telenoobie/osmo-bts,geosphere/osmo-bts,osmocom/osmo-bts,telenoobie/osmo-bts,shimaore/osmo-bts,geosphere/osmo-bts,shimaore/osmo-bts,telenoobie/osmo-bts,osmocom/osmo-bts