rtw88: Make two functions static

Fix sparse warnings:

drivers/net/wireless/realtek/rtw88/fw.c:633:4: warning:
 symbol 'rtw_get_rsvd_page_probe_req_location' was not declared. Should it be static?
drivers/net/wireless/realtek/rtw88/fw.c:650:5: warning:
 symbol 'rtw_get_rsvd_page_probe_req_size' was not declared. Should it be static?
Reported-by: NHulk Robot <hulkci@huawei.com>
Signed-off-by: NYueHaibing <yuehaibing@huawei.com>
Signed-off-by: NKalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200328030524.16032-1-yuehaibing@huawei.com

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

@@ -630,8 +630,8 @@ void rtw_fw_set_pg_info(struct rtw_dev *rtwdev)
 	rtw_fw_send_h2c_command(rtwdev, h2c_pkt);
 }
 
-u8 rtw_get_rsvd_page_probe_req_location(struct rtw_dev *rtwdev,
-					struct cfg80211_ssid *ssid)
+static u8 rtw_get_rsvd_page_probe_req_location(struct rtw_dev *rtwdev,
+					       struct cfg80211_ssid *ssid)
 {
 	struct rtw_rsvd_page *rsvd_pkt;
 	u8 location = 0;
@@ -647,8 +647,8 @@ u8 rtw_get_rsvd_page_probe_req_location(struct rtw_dev *rtwdev,
 	return location;
 }
 
-u16 rtw_get_rsvd_page_probe_req_size(struct rtw_dev *rtwdev,
-				     struct cfg80211_ssid *ssid)
+static u16 rtw_get_rsvd_page_probe_req_size(struct rtw_dev *rtwdev,
+					    struct cfg80211_ssid *ssid)
 {
 	struct rtw_rsvd_page *rsvd_pkt;
 	u16 size = 0;