spi-tegra: revert some changes. keep idle mode in.

Change-Id: Ie9cecbe3a806ff34f39e0b0968c5046736088d02
oc: modify frequencies and voltages

Change-Id: I43158cd0454d44d286750bd2a143f7de27c9679a
oc: fix derp
wifi: remove useless wakelock
auto_hotplug: refactor and enable only on deep sleep