Revert "Bring Forward LTE Checks to fix Invalid Signal"

This reverts commit c01f6b3df1b7b7de48c950345ea5649bde533573.
Telephony: Signal Strength: use getAlternateLteLevel()

instead of getLteLevel()

Fixes: In low LTE, ASU level shows as 99 (invalid)

Change-Id: I5c2bd722655b6c4009119cba61e0a169adb3d7d4