Enhance the base/rom extension to generate the symbol file of the rom built.
The symbol file is placed in epoc32/rom/<baseport_name>, along with the rom log and final oby file.
EXPORTS
_Z20CreatePhysicalDevicev @ 1 NONAME
_ZN17DIicBusController16RegisterChannelsEPP14DIicBusChanneli @ 2 NONAME
_ZN17DIicBusController17DeRegisterChannelEP14DIicBusChannel @ 3 NONAME
_ZN20TIicBusSlaveCallback7DfcFuncEPv @ 4 NONAME
_ZN6IicBus14CaptureChannelEiP5TDes8P20TIicBusSlaveCallbackRii @ 5 NONAME
_ZN6IicBus14ReleaseChannelEi @ 6 NONAME
_ZN6IicBus15StaticExtensionEjjPvS0_ @ 7 NONAME
_ZN6IicBus16QueueTransactionEiP18TIicBusTransaction @ 8 NONAME
_ZN6IicBus16QueueTransactionEiP18TIicBusTransactionP15TIicBusCallback @ 9 NONAME
_ZN6IicBus16RegisterRxBufferEi5TPtr8aaa @ 10 NONAME
_ZN6IicBus16RegisterTxBufferEi5TPtr8aaa @ 11 NONAME
_ZN6IicBus17CancelTransactionEiP18TIicBusTransaction @ 12 NONAME
_ZN6IicBus22SetNotificationTriggerEii @ 13 NONAME