There is an updated pull request by pbui against master on the void-packages repository

https://github.com/pbui/void-packages rpi-firmware
https://github.com/void-linux/void-packages/pull/27117

rpi-firmware: provide and replace linux-firmware-broadcom
As reported by amak79, the blobs provided by linux-firmware-broadcom are
not as up-to-date as those provided by the Raspberry Pi foundation nor
do they supply a blob for the Pi Zero.  Therefore, revert to packaging
the latest wifi blobs from RPi-Distro.

To resolve the conflict with the broadcom drivers, this package now
provides and replaces linux-firmware-broadcom.  This allows for
rpi-firmware and linux-firmware-network to coexist (just without the
non-Raspberry Pi broadcom drivers).  This should satisfy most use cases.

A patch file from https://github.com/void-linux/void-packages/pull/27117.patch is attached