linux-firmware: update Marvell SD8897-B0 firmware combo image

WLAN (SDIO) firmware version: 15.68.4.p22
Bluetooth (SDIO) firmware version: 15.28.4.p22

The combo image can be downloaded through either WLAN or Bluetooth.
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: Frank Huang <frankh@marvell.com>

WHENCE

@@ -730,7 +730,7 @@ File: mrvl/sd8797_uapsta.bin
 Version: 14.66.11.p151
 
 File: mrvl/sd8897_uapsta.bin
-Version: 15.69.2.p11
+Version: 15.68.4.p22
 
 File: mrvl/usb8797_uapsta.bin
 Version: 14.68.29.p26