wifi: rtw89: 8851b: enable hw_scan support

This enables hw_scan for 8851b after firmware version 0.29.37.1.
Extend the channel info struct with padding zeros so newer firmware
can work properly, this change is backward compatible with older
firmware.
Signed-off-by: Po-Hao Huang <phhuang@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230531060713.57203-2-pkshih@realtek.com

drivers/net/wireless/realtek/rtw89/fw.c

@@ -257,6 +257,7 @@ struct __fw_feat_cfg {
 
 static const struct __fw_feat_cfg fw_feat_tbl[] = {
 	__CFG_FW_FEAT(RTL8851B, ge, 0, 29, 37, 1, TX_WAKE),
+	__CFG_FW_FEAT(RTL8851B, ge, 0, 29, 37, 1, SCAN_OFFLOAD),
 	__CFG_FW_FEAT(RTL8852A, le, 0, 13, 29, 0, OLD_HT_RA_FORMAT),
 	__CFG_FW_FEAT(RTL8852A, ge, 0, 13, 35, 0, SCAN_OFFLOAD),
 	__CFG_FW_FEAT(RTL8852A, ge, 0, 13, 35, 0, TX_WAKE),

drivers/net/wireless/realtek/rtw89/fw.h

@@ -243,7 +243,7 @@ struct rtw89_fw_macid_pause_grp {
 #define RTW89_SCANOFLD_MAX_IE_LEN 512
 #define RTW89_SCANOFLD_PKT_NONE 0xFF
 #define RTW89_SCANOFLD_DEBUG_MASK 0x1F
-#define RTW89_MAC_CHINFO_SIZE 24
+#define RTW89_MAC_CHINFO_SIZE 28
 #define RTW89_SCAN_LIST_GUARD 4
 #define RTW89_SCAN_LIST_LIMIT \
 		((RTW89_H2C_MAX_SIZE / RTW89_MAC_CHINFO_SIZE) - RTW89_SCAN_LIST_GUARD)