LS980: Update PRODUCT_PROPERTY_OVERRIDES align more with stock.

"NO SIM CARD - SPRINT" message is currently showing on lockscren.
This change, along with g2-common device specific gps.conf files
using SPR instead of OPEN for LS980 may remove the message.

On LS980 factory stock ROM, it would say "NO SIM CARD" when build.prop
ro.build.target_operator was changed from SPR to OPEN.

Change-Id: I9da8f323ad68e6e0329f3c43e81918804a3b7e19