manifests: name wifi/BT firmware files in packages lists

These were demoted to a recommends in F39 and we're not sure
if we want to drop them yet:
coreos/fedora-coreos-tracker#1575

manifests/fedora-coreos-base.yaml

@@ -158,6 +158,8 @@ packages:
  - iptables-legacy
  # GPU Firmware files (not broken out into subpackage of linux-firmware in RHEL yet)
  - amd-gpu-firmware intel-gpu-firmware nvidia-gpu-firmware
+ # Wifi/BT firmware files https://github.com/coreos/fedora-coreos-tracker/issues/1575
+ - atheros-firmware brcmfmac-firmware mt7xxx-firmware realtek-firmware
 
 
 # - irqbalance