bta_ag_at_parse() function

* Function bta_ag_at_init * Description Initialize the AT command parser control block. * Returns void

* Function bta_ag_at_reinit * Description Re-initialize the AT command parser control block. This * function resets the AT command parser state and frees * any GKI buffer. * Returns void

* Function bta_ag_process_at * Description Parse AT commands. This function will take the input * character string and parse it for AT commands according to * the AT command table passed in the control block. * Returns void