bug#35574: bcm5974 touchpad is not recognized as touchpad

[Mathieu Othacehe]

Hello Florian,

> This avoids a race with the bcm5974 kernel module.
> Fixes <https://bugs.gnu.org/35574>.

This seems indeed better than not building the module.

I know that (for now) having a mouse in the installer is not very
useful. But maybe `kernel-arguments' in (gnu system install) should
inherit from this field?

Thanks,

Mathieu