telephony: Fix roaming icon setting

Currently, if data roaming is true and gsm roaming is true,
roaming icon is always true.
But, in this case, roamin icon shoould depends on other condition,
i.e., same named operators or operator considered non-roaming.

Bug: 10642211
Change-Id: Ia98ffeec5dc013cf045b15c9a7c53c4a24f2eeb5