There's a merged pull request on the void-packages repository

rpi-kernel: enable build of kernel modules
https://github.com/void-linux/void-packages/pull/14823

Description:
Thanks to @marmeladema (#8480 ,  b5fa1bd9b6ec04c20bc1fe01540295200ef552d9) (and @Hoshpak for making me aware of this commit)

(I only run an rpi3 with aarch64, so my testing is limited)
- (cross)builds for: armv6l, armv7l and aarch64.
- Boots on: aarch64.
- Compiles dkms on: aarch64 (when rpi-kernel-headers is installed manually, which we should deal with later).

@pbui