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
ResourceManager__24TTemplatePowerController @ 1 NONAME R3UNUSED ; TTemplatePowerController::ResourceManager(void)
WakeupEvent__24TTemplatePowerController @ 2 NONAME R3UNUSED ; TTemplatePowerController::WakeupEvent(void)