rtw88: mark rtw_fw_hdr __packed

The use of u8 and __le16 in this struct assumes that it's going to be
packed to byte alignment. C doesn't guarantee that, so we should mark
this __packed.

Fixes: cc20a713 ("rtw88: use struct rtw_fw_hdr to access firmware header")
Cc: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

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

@@ -127,7 +127,7 @@ struct rtw_fw_hdr {
 	__le32 emem_size;
 	__le32 emem_addr;
 	__le32 imem_addr;
-};
+} __packed;
 
 /* C2H */
 #define GET_CCX_REPORT_SEQNUM(c2h_payload)	(c2h_payload[8] & 0xfc)