Add a keywords for "Pair new deivce"

In new search version, our search won't show summary anymore.
So, we should add a new keyword so that search can find this
setting with "bluetooth" query.

Test: Rebuilt rom and see "Pair new device" in search
Fix: 15575560
Change-Id: I50b5ab10aafcab423f24341229f69c06b0176643