tuna: Delete debug code

 PS 2: Deleted dependencies

Change-Id: I3ca48bf5bc5986fd55103d13ebcbfd073e5ac546
tuna: Revert WiFi sleep power mode

Since cm-10.2 branch, DeviceSettings is not supported and
wifi power mode isn't accessible by the user.

Also, there is a new adjustment for optimizing WiFi in AOSP.

Change-Id: If2d4d57c287be70cfd3dedc49c3206e2e9470dc8
Merge branch 'cm-10.2' into martincz