linux-firmware: update NXP PCIE-USB-8997 firmware image

WLAN (PCIE) firmware version: W16.68.10.p159
Bluetooth (USB) firmware version: W16.26.10.159

The combo image can be downloaded either through WLAN.

Signed-off-by: Rakesh Parmar <rakesh.parmar@nxp.com>
Signed-off-by: Sharvari Harisangam <sharvari.harisangam@nxp.com>

WHENCE

@@ -774,6 +774,8 @@ Version: W16.68.1.p195
 File: nxp/sd8801_uapsta.bin
 Version: W14.76.36.p139
 
+File: nxp/pcieusb8997_combo_v4.bin
+Version: W16.68.10.p159
 Licence: Redistributable. See LICENCE.NXP for details.  Originates from
 https://github.com/NXP/mwifiex-firmware.git