acpi_spmc(4): acpi_spmc_probe_dsm(): Remove passing superfluous handle

[olce]

Summary

The handle is already held by the softc, which is also passed.

No functional change (intended).

[olce]

Impact of D56756's update.

[obiwac]

could we just roll this change into D56756?

[olce]

Mmm, since it's a self-contained change, I'd rather we keep it like that on commit (even if it's a tiny commit).

[olce]

Impacts of changes in earlier revisions, no real change.