d2: Enable HW_AVS

 * We previously had an issue with HW_AVS when using the interactive
   cpufreq governor due to some derpiness in the way SPM changed the
   acpuclock.
 * This has been fixed by Qualcomm in commit
   8ad40ba6da84b27cebf87983fd230b77923d09ad so let's enable it.

Change-Id: I5f1e47074d76d2d14764042d5e474ed0edd9b6e0