Display roaming indicator icon only based on ERI in CDMA case.

Fixing CV failure. In some scenario where ERI table expects
"Roaming Indicator OFF", R icon was still displayed on
the status bar. This patch is to update the logic so that
only ERI table is used to display R icon in case of CDMA.

Bug:5932154
Change-Id: I125087cc8d700b102e05c3050d88a70485c9a86e