linux-firmware: update Marvell PCIe-USB8997 firmware image

Firmware version for this image is 16.68.1.p140

In PCIe-USB chipset, WLAN is over PCIe whereas bluetooth is over
USB.
Signed-off-by: Cathy Luo <cluo@marvell.com>
Signed-off-by: James Cao <jcao@marvell.com>
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.p133
+Version: 16.68.1.p140
 
 File: mrvl/pcie8997_wlan_v4.bin
 Version: 16.68.1.p97