Hello all,
Glad to inform that I have found the solution for above discussed question. It goes as follows:
1. Connect USB_DBG_DD to DD pin of CC2530.
2. Connect USB_DBG_DC to DC pin of CC2530.
3. Connect IO_EM_RESET to RESET pin of CC2530.
4. Connect GND of the board (from any on of the GND pinout) to GND of CC2530.
5. Give external CC2530 power (if possible from the SmartRF05EB itself).
6. "Download and Debug" as usual, to program the externally connected CC2530.
That's it. Thank you all. :)