Fix mapping of signal strength to signal bars

Open-webOS-DCO-1.0-Signed-off-by: Sapna Todwal <sapna.todwal@lge.com>

Change-Id: Ia9ccb084eccd2d52dc568d5e909a3aea8af8e1cc
Reviewed-on: https://g2g.palm.com/1668
Reviewed-by: Build Verification
Tested-by: Sapna Todwal <sapna.todwal@lge.com>
Reviewed-by: Keith Derrick <keith.derrick@lge.com>
Reviewed-by: Sapna Todwal <sapna.todwal@lge.com>