Revert "arch: arm: omap2: hardcode voltages since we're testing SmartReflex-disabled builds."

This reverts commit e9fb98f327c5633184aa4589986bf67e32455dae.
Derp.
Revert "arch: omap: add userspace export of the current GPU clock. Works mostly like scaling_cur_freq."

This reverts commit 313a9d9c1b227ce36f4afe6bb14467ac22dbe741.
derp2