BTA_SdpEnable() function

* Function BTA_SdpEnable * Description Enable the SDP search I/F service. When the enable * operation is complete the callback function will be * called with a BTA_SDP_ENABLE_EVT. This function must * be called before other functions in the SDP search API are * called. * Returns BTA_SDP_SUCCESS if successful. * BTA_SDP_FAIL if internal failure.