BTM_BuildOobData() function

* Function BTM_BuildOobData * Description This function is called to build the OOB data payload to * be sent over OOB (non-Bluetooth) link * Parameters: p_data - the location for OOB data * max_len - p_data size. * c - simple pairing Hash C. * r - simple pairing Randomizer C. * name_len- 0, local device name would not be included. * otherwise, the local device name is included for * up to this specified length * Returns Number of bytes in p_data.