Frameworks : move custom strings to cm_strings.xml

Change-Id: Ie70f69474b9e83b6f9e2df4d34d6109008343356
Telephony: Consider EVDO ecio zero value as valid.

When mEvdoEcio receives 0 getEvdoEcio returns -1.

Ecio valid values are positive integers, to fix this
consider EVDO ecio zero value as valid.

Change-Id: Ice8415150e7502c7f39e1a4135d35ea2bec1eb1f
CRs-Fixed: 402159