wifi: rtl8xxxu: Declare AP mode support for 8188f

Everything is in place now for AP mode, we can tell the system that we
support it. Put the feature behind a flag in priv->fops, because it is
not (yet) implemented for all chips.
Signed-off-by: Martin Kaistra <martin.kaistra@linutronix.de>
Reviewed-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230428150833.218605-18-martin.kaistra@linutronix.de

drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.h

@@ -1943,6 +1943,7 @@ struct rtl8xxxu_fileops {
 	u8 init_reg_hmtfr:1;
 	u8 ampdu_max_time;
 	u8 ustime_tsf_edca;
+	u8 supports_ap:1;
 	u32 adda_1t_init;
 	u32 adda_1t_path_on;
 	u32 adda_2t_path_on_a;

drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c

@@ -1748,6 +1748,7 @@ struct rtl8xxxu_fileops rtl8188fu_fops = {
 	.init_reg_hmtfr = 1,
 	.ampdu_max_time = 0x70,
 	.ustime_tsf_edca = 0x28,
+	.supports_ap = 1,
 	.adda_1t_init = 0x03c00014,
 	.adda_1t_path_on = 0x03c00014,
 	.trxff_boundary = 0x3f7f,

drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c

@@ -7533,6 +7533,8 @@ static int rtl8xxxu_probe(struct usb_interface *interface,
 	hw->wiphy->max_scan_ssids = 1;
 	hw->wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 	hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
+	if (priv->fops->supports_ap)
+		hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP);
 	hw->queues = 4;
 
 	sband = &rtl8xxxu_supported_band;