wcn36xx: Implement multicast filtering

Pass the multicast list to FW.

This patch also adds a way to build the smd command in place. This is
needed because the MC list command is too big for the stack.

Signed-off-by: Pontus Fuchs <pontus.fuchs@gmail.com>
[bjorn: dropped FIF_PROMISC_IN_BSS usage]
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

drivers/net/wireless/ath/wcn36xx/hal.h

@@ -4267,9 +4267,9 @@ struct wcn36xx_hal_rcv_flt_mc_addr_list_type {
 	u8 data_offset;
 
 	u32 mc_addr_count;
-	u8 mc_addr[ETH_ALEN][WCN36XX_HAL_MAX_NUM_MULTICAST_ADDRESS];
+	u8 mc_addr[WCN36XX_HAL_MAX_NUM_MULTICAST_ADDRESS][ETH_ALEN];
 	u8 bss_index;
-};
+} __packed;
 
 struct wcn36xx_hal_set_pkt_filter_rsp_msg {
 	struct wcn36xx_hal_msg_header header;
@@ -4323,7 +4323,7 @@ struct wcn36xx_hal_rcv_flt_pkt_clear_rsp_msg {
 struct wcn36xx_hal_rcv_flt_pkt_set_mc_list_req_msg {
 	struct wcn36xx_hal_msg_header header;
 	struct wcn36xx_hal_rcv_flt_mc_addr_list_type mc_addr_list;
-};
+} __packed;
 
 struct wcn36xx_hal_rcv_flt_pkt_set_mc_list_rsp_msg {
 	struct wcn36xx_hal_msg_header header;