BTA_JvEnable() function

* Function BTA_JvEnable * Description Enable the Java I/F service. When the enable * operation is complete the callback function will be * called with a BTA_JV_ENABLE_EVT. This function must * be called before other function in the JV API are * called. * Returns BTA_JV_SUCCESS if successful. * BTA_JV_FAIL if internal failure.