improve a calculation method for LTE antenna reception level --Current calculation uses a RSSNR value but it is unsuitable for accurate reception level. (The measurement requirement for RSSNR does not exist in 3GPP.) Instead, it should use a RSRQ value defined by 3GPP specification: TS 36.214. -- The minimum level of RSRQ required to display Antenna icon should be the minimum value of Qqualmin which is a minimum required RSRQ defined by 3GPP specification: TS 36.331 RRC. Also RSRP value thresholds is relatively high compared with other mobile phone platforms, which make android seems low sensitive to radio. This patch sets better thresholds. Change-Id: I502e1c3d08b2a52c51fe93da9b77476ac827a25b --Kensuke Ueda --alerted to me by Buck Marble