HFP: Match signal strength level between AG and HF

HFP use getLteLevel to denote signal strength, while statusbar
use getLevel, so 2G/3G signal strength level do not match between
AG(phone) and HF(carkit). Use getLevel instead of getLteLevel in
HFP to make 2G/3G signal strength level same for AG and HF.

CRs-Fixed: 2030649
Change-Id: I9290134a7ffe915b2b748d1b487f059ef76be49d
1 file changed