rtw88: fix sparse warnings for power tracking

sparse warnings:
    drivers/net/wireless/realtek/rtw88/rtw8822b.c:1440:6: sparse: sparse:
    symbol 'rtw8822b_pwr_track' was not declared. Should it be static?
    drivers/net/wireless/realtek/rtw88/rtw8822c.c:1008:6: sparse: sparse:
    symbol 'rtw8822c_pwrtrack_init' was not declared. Should it be static?

Fixes: c97ee3e0 ("rtw88: add power tracking support")
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Yan-Hsuan Chuang <yhchuang@realtek.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/realtek/rtw88/rtw8822b.c

@@ -1492,7 +1492,7 @@ static void rtw8822b_phy_pwrtrack(struct rtw_dev *rtwdev)
 		rtw8822b_do_iqk(rtwdev);
 }
 
-void rtw8822b_pwr_track(struct rtw_dev *rtwdev)
+static void rtw8822b_pwr_track(struct rtw_dev *rtwdev)
 {
 	struct rtw_efuse *efuse = &rtwdev->efuse;
 	struct rtw_dm_info *dm_info = &rtwdev->dm_info;

drivers/net/wireless/realtek/rtw88/rtw8822c.c

@@ -1006,7 +1006,7 @@ static void rtw8822c_rf_init(struct rtw_dev *rtwdev)
 	rtw8822c_rf_x2_check(rtwdev);
 }
 
-void rtw8822c_pwrtrack_init(struct rtw_dev *rtwdev)
+static void rtw8822c_pwrtrack_init(struct rtw_dev *rtwdev)
 {
 	struct rtw_dm_info *dm_info = &rtwdev->dm_info;
 	u8 path;