Revert " arch: omap: export current IVA clock to userspace, make GPU+IVA expor…"

This reverts commit f58d895a16a7eff81758ff19bf6cb39a3911bdcb.
Revert "arch: omap: add userspace export of the current GPU clock. Works mostly like scaling_cur_freq."

This reverts commit b46cd02389400772deb75eb41de142998459e9a2.
Revert "Added Custom Voltage version 3."

This reverts commit 24f7879f90b79906d2764936a250f01be7ce244d.