Current TW, for example has:
# modinfo -F firmware brcmfmac.ko.xz | head -2
brcm/brcm/brcmfmac*-pcie.*.txt
brcm/brcm/brcmfmac*-sdio.*.txt
This looks entirely wrong to me.
That said, I'm actually not sure what drags in *clm_blob currently.
> From here you can see that only brcmfmac43456-sdio.clm_blob file is present,
> while the driver is looking for brcmfmac43455-sdio.clm_blob.
As said, please check your config.