Fix Klocwork errors in liblight

1. Fix null pointer de-reference klocwork error in liblight.
2. sprintf is part of ScanBan function. Replace sprintf with snprintf.

Change-Id: If408be6040481f5edda78cfeed477b30ab5b5e73
(cherry picked from commit ded095b33c7405f5f209716abfae7708fc04162d)
serrano: Remove dual-sim stuff

* Let the dual-sim guys deal with this in their device repo

Change-Id: I7b48cf4fe72a061bd119459100e56b4efaf838ef
(cherry picked from commit c1a57323bfec060da1676f64be024e88dfd1d0b2)
serrano: Remove zcache from command line

* We're not building support for it in the new kernel

Change-Id: Iaeb204bd6d8e0068e88e71ec1c4d5a8097e63780
(cherry picked from commit c89b5db1136746543ede1d582e49ed06836ca567)