acpi_spmc: Fix checking expected DSMs

[obiwac]

Summary

Previously was or'ing the indices of the DSMs directly, not their corresponding bits. This commit rectifies this.

Sponsored by: The FreeBSD Foundation

Test Plan

dsms_expected for AMD and MS DSM sets are now equivalent (except for the enum functions bit, which we remove in acpi_spmc_check_dsm_set()) to what's returned in the enum functions DSM.