Check packet length in bta_av_proc_meta_cmd

Bug: 111893951
Test: manual - connect A2DP
Change-Id: Ibbf347863dfd29ea3385312e9dde1082bc90d2f3
(cherry picked from commit ed51887f921263219bcd2fbf6650ead5ec8d334e)

void bta_av_rc_browse_close(tBTA_AV_CB* p_cb, tBTA_AV_DATA* p_data) {
  APPL_TRACE_WARNING("%s: empty placeholder does nothing!", __func__);
}

void bta_av_rc_browse_close(tBTA_AV_CB* p_cb, tBTA_AV_DATA* p_data) {
  APPL_TRACE_WARNING("%s: empty placeholder does nothing!", __func__);
}
