[FM] PS will disappear after refreshing stations if the station is not added to Favorites

Launch FM and play a station with PS(the station is not
added to Favorites) -> Refresh channels -> After searching
out the channels and tap Back key -> Check the PS information,
PS information will disappear.

The fix is to set correct station name.

from: https://partner-android-review.googlesource.com/#/c/192378/



Bug 18842996

Change-Id: Ib691d3d1472fe032f528987173d3b186ee17bf06
Signed-off-by: Benson Huang <benson.huang@mediatek.com>