The solution faith published by velkerk in this thread (these files are present in AUR) in 2017.
They are SAS/SCSI disk controllers, already in disuse.
aic94xx-firmware: Adaptec SAS 44300, 48300, 58300 Sequencer Firmware for AIC94xx driver. wd719x-firmware: Driver for Western Digital WD7193, WD7197 and WD7296 SCSI cards.
If you do not use any of these hardwares, you can continue with these "error messages" without problems. It is preferable not to install drivers that are not officially supported, unless it is necessary for your system.
It is an interesting information, to know in this case, what these two modules do.