It seems like this warning has been around since August 2020.
(4/9) Updating linux initcpios...
==> Building image from preset: /etc/mkinitcpio.d/linux515.preset: 'default'
-> -k /boot/vmlinuz-5.15-x86_64 -c /etc/mkinitcpio.conf -g /boot/initramfs-5.15-x86_64.img
==> Starting build: 5.15.16-1-MANJARO
-> Running build hook: [base]
-> Running build hook: [udev]
-> Running build hook: [autodetect]
-> Running build hook: [modconf]
-> Running build hook: [block]
-> Running build hook: [keyboard]
-> Running build hook: [keymap]
-> Running build hook: [encrypt]
==> WARNING: Possibly missing firmware for module: qat_4xxx
How can I silence this warning?