linux-firmware: update Marvell SD8897-B0 firmware image

WLAN (SDIO) firmware version: W15.68.19.17
Bluetooth (SDIO) firmware version: 15.26.19.17
The combo image can be downloaded through either WLAN or
Bluetooth.
Signed-off-by: Ganapathi Bhat <gbhat@marvell.com>

WHENCE

@@ -736,7 +736,7 @@ File: mrvl/usb8797_uapsta.bin
 Version: 14.68.29.p49
 
 File: mrvl/sd8897_uapsta.bin
-Version: V15.68.7.154
+Version: W15.68.19.17
 
 File: mrvl/usb8897_uapsta.bin
 Version: 15.68.4.p103