Add dummy strings to prevent aapt warnings

Change-Id: I13e2b603bafd79bec87ee3c3e04ec8e4d5839ac2
Revert "BT: Multi HF support in Settings App."

This reverts commit 7bbd90528064516a4aae200731a7fd60acd09192.

Change-Id: I51b37f921c13112b1cd10bfae358cd97ff48a000