Set DBG Flag False for CellSignalStrengthLte

The debug flag for CellSignalStrengthLte was left
"true" due to "f23153f1 - Refactor SignalStrength".

This CL sets it to false to fix log spam.

Bug: 122545223
Test: compilation
Change-Id: I680224ba726dde26c1e45584bd37d85bc02aa91a