staging: rtl8821ae: add static for local symbols in halbtc8723b2ant.c

This commit fixes the sparse warning:

    "warning: symbol 'X' was not declared. Should it be static?"

Where the X is one of the following:

    glbt_info_src_8723b_2ant
    glcoex_ver_date_8723b_2ant
    glcoex_ver_8723b_2ant
    halbtc8723b2ant_bt_rssi_state
    halbtc8723b2ant_wifi_rssi_state
    halbtc8723b2ant_monitor_bt_enable_disable
    halbtc8723b2ant_monitor_bt_ctr
    halbtc8723b2ant_query_bt_info
    halbtc8723b2ant_is_wifi_status_changed
    halbtc8723b2ant_update_bt_link_info
    halbtc8723b2ant_action_algorithm
    halbtc8723b2ant_need_to_dec_bt_pwr
    halbtc8723b2ant_set_fw_dac_swing_level
    halbtc8723b2ant_set_fw_dec_bt_pwr
    halbtc8723b2ant_dec_bt_pwr
    halbtc8723b2ant_set_bt_auto_report
    halbtc8723b2ant_bt_auto_report
    halbtc8723b2ant_fw_dac_swing_lvl
    halbtc8723b2ant_set_sw_rf_rx_lpf_corner
    halbtc8723b2ant_rf_shrink
    halbtc8723b2ant_set_sw_penalty_txrate_adaptive
    halbtc8723b2ant_low_penalty_ra
    halbtc8723b2ant_set_dac_swing_reg
    halbtc8723b2ant_set_sw_fulltime_dac_swing
    halbtc8723b2ant_dac_swing
    halbtc8723b2ant_set_adc_backoff
    halbtc8723b2ant_adc_backoff
    halbtc8723b2ant_set_agc_table
    halbtc8723b2ant_agc_table
    halbtc8723b2ant_set_coex_table
    halbtc8723b2ant_coex_table
    halbtc8723b2ant_coex_table_with_type
    halbtc8723b2ant_set_fw_ignore_wlan_act
    halbtc8723b2ant_ignore_wlan_act
    halbtc8723b2ant_set_fw_ps_tdma
    halbtc8723b2ant_sw_mechanism1
    halbtc8723b2ant_sw_mechanism2
    halbtc8723b2ant_set_ant_path
    halbtc8723b2ant_ps_tdma
    halbtc8723b2ant_coex_alloff
    halbtc8723b2ant_init_coex_dm
    halbtc8723b2ant_action_bt_inquiry
    halbtc8723b2ant_is_common_action
    halbtc8723b2ant_tdma_duration_adjust
    halbtc8723b2ant_action_sco
    halbtc8723b2ant_action_hid
    halbtc8723b2ant_action_a2dp
    halbtc8723b2ant_action_a2dp_pan_hs
    halbtc8723b2ant_action_pan_edr
    halbtc8723b2ant_action_pan_hs
    halbtc8723b2ant_action_pan_edr_a2dp
    halbtc8723b2ant_action_pan_edr_hid
    halbtc8723b2ant_action_hid_a2dp_pan_edr
    halbtc8723b2ant_action_hid_a2dp
    halbtc8723b2ant_run_coexist_mechanism
    halbtc8723b2ant_wifioff_hwcfg
Signed-off-by: Konrad Zapalowicz <bergo.torino@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>