Framework: Fix GSM signal strength

Certain OEM gsm ril libs send back a bogus value for LTE signal
that causes SignalStrength.java to default to LTE and report
incorrect signal values.
Use prop value ro.telephony.ril.v3=signalstrength to get proper
GSM signal reading on certain devices.

Signed-off-by: dhacker29 <davidhackerdvm@gmail.com>

Change-Id: I86279dcbc350fe718d89070acc12178de3c600c2
Signal strength: add more checks to signal strength,
so it doesn't fall under the range of poor signal and automatically
assumes a gsm signal, actually checks if all values are true and not
valid then pass it on to lte or gsm. This fixes cases when gsm signal
is not valid and lte is active. When lte is active and shows a really
weak and gsm signal is not avalible due some broken vendor ril or
just running cdma lte and a few others senario creates this issue.

Change-Id: Ib0d04adbf615502081470bd03d995228f1d40d81
telephony: hide needsOldRilFeature

Change-Id: I741b510fdacc166ad40741bf2e9db5c8a1039384