Revert "Tegra: userspace voltage control"

I'm going to use the automatic dfll mode instead.

This reverts commit 08634227f8a46ea14f0df7e61a679530af390c17.
Flounder: fix touch not responding if doubletap2wake feature is enabled/disabled while screen is off
Revert "Linaro 4.9.2: fix compile errors"

This reverts commit a1625a075417adfd29e1416b3f62bc9240c44e43.
update defconfig