Fix getAsuLevel returns "99" in Lte and TdScdma.

GetAsuLevel method judges valid signal by
getLteLevel/getTdScdmaLevel. However, level is
SIGNAL_STRENGTH_NONE_OR_UNKNOWN does not mean not in
Lte/TdScdma.
For example, if mLteRsrp is in (threshRsrp[1],
threshRsrp[0]], getLteLevel would return
SIGNAL_STRENGTH_NONE_OR_UNKNOWN. But this only
means Lte signal is very weak, and ASU should be
(mLteRsrp + 140) not "99" (3GPP 27.007 Sec 8.69).

Bug: 72116430
Test: Build
Change-Id: If930c3e3d23a9af7b2e51e3560cc28607a6328c0