linux-firmware: update Marvell PCIe-USB8997 firmware image

WLAN (PCIe) firmware version: W16.68.1.p195
Bluetooth (USB) firmware version: 16.26.1.p195

In PCIe-USB chipset, WLAN is over PCIe whereas bluetooth is over
USB. The combo image will be downloaded through WLAN only.
Signed-off-by: Ganapathi Bhat <gbhat@marvell.com>

WHENCE

@@ -757,7 +757,7 @@ File: mrvl/pcieuart8997_combo_v4.bin
 Version: 16.68.1.p70
 
 File: mrvl/pcieusb8997_combo_v4.bin
-Version: 16.68.1.p145
+Version: W16.68.1.p195
 
 File: mrvl/pcie8997_wlan_v4.bin
 Version: 16.68.1.p97