Bring back the SECONDARY_STORAGE variable

This variable is a requirement in KK as newly introduced APIs
such as Context.getExternalFilesDirs uses it to retrieve
secondary storage locations on the device.

Change-Id: I17708c93498da5979c5742cad32232a34490bf5f
Remove CM Torch overlay

Change-Id: I5fc74d5ce67e8fe2dc149d0277203a88fc8d3437