Fixed display of '2147483647' on statusbar

For telephony  network signal strength text view
for some invalid signal values instead of displaying
Integer max use -∞.

Change-Id: I93a16a3b16df7a18cc805356904ab9027e7d0aee
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_frameworks_base into android-4.4