mwifiex: update rx packet descriptor structure to match FW

RX packet descriptor structure has recently changed in FW.
This patch updates rxpd accordingly.
Signed-off-by: NAvinash Patil <patila@marvell.com>
Signed-off-by: NCathy Luo <cluo@marvell.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/mwifiex/fw.h

@@ -584,6 +584,7 @@ struct rxpd {
 	 * [Bit 7] Reserved
 	 */
 	u8 ht_info;
+	u8 reserved[3];
 	u8 flags;
 } __packed;