Revert "OmniTorch for Nexus 5 (hammerhead)"

This reverts commit 0503aa2280b7236b75c10925fd97a061411a400b.
Revert "hammerhead: Enable volume button wake"

This reverts commit b9fed1c19282980d15dbbbf7a14053cc47d2f513.
Revert "hammerhead: Enable Button menu in Settings"

This reverts commit 99780d4b2686064866eee4a63f68ad771a82d078.
Revert "hammerhead: Add OmniTorch Overlay"

This reverts commit 698d26e958bc91bb5cfb1554f91b5d50d510d3ec.
Revert "liblight: Add battery light support"

This reverts commit 2b8636625a5fec47bb6b9a65f490b6d3864025cb.
Revert "audio_effects: Add stereowide effect"

This reverts commit ca8881126097db1dd2a057bb915f51170e520c4d.
Revert "Add the CM DSP library to the device-specific effects table"

This reverts commit 233f65f520067dad66573ec6febf08ad23ba5d9f.