Revert "board_mapphone_usb: Change ehci performance mode to static scaling - might fix lte connectivity"

This reverts commit 03a522514ae7bd4c7af4f5870efd7194a780195d.
Revert "OMAP3+: PM: DVFS: add qos requirement to prevent interruptions"

This reverts commit f3b4d274d7465f406e0d9f0df57e8288e1f6b742.
Revert "OMAP3+: PM: DVFS: remove omap_dvfs_is_scaling"

This reverts commit 4d0415a1748ea97ba20719882ae93aa631ff8dda.