omap: opp: cleanup and enable IVA OPP4 to prevent crashes on HDMI sound

Change-Id: I560c06870c24ef7b9d6d66583ede5bcf7b004cb3
omap: cpu: update cpuidle driver and fix syntax for pm
omap: sound: remove OPP_PATCH to prevent conflicts with HDMI sound
remoteproc, rpmsg: Update to 3.0.31
Remove DSS handler for DSS, revert IVA changes
Finally enable IVA freqs
cfg80211: Fix memory leak

When a driver requests a specific regulatory domain after cfg80211 already
has one, a struct ieee80211_regdomain is leaked.