LCE feature enhancement
LCE feature enhancement

- space pollLceData calls every 500ms
- cluster multiple pending pollLceData calls into one
- cherry pick from mwd to mnc-dev

Bug: 21307957
Change-Id: I04513011db3ae29af02bd54fe91cb8e0d4ab9f12

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base