Support Signal strength offset

Support feature to offset LTE rsrp
for higher freaquency lte bands.

Test: Verified on device that signal bars increased
Bug=30628343
Merged-In: Id0b54901a1e8832fb48ba509e6a380c43f4c9497
Change-Id: Id0b54901a1e8832fb48ba509e6a380c43f4c9497
3 files changed