Update talkback text for device details gear button

Announce "Device name + Configure device detail. Double tap to activate"
instead of "Settings"

Flag: EXEMPT small fix
Bug: 379994439
Test: manual
Change-Id: I8a0d620c2aba0ada559ea3617535413bed8eee48

src/com/android/settings/bluetooth/BluetoothDevicePreference.java

@@ -338,6 +338,9 @@ public final class BluetoothDevicePreference extends GearPreference {
 
         if (mCachedDevice.getBondState() == BluetoothDevice.BOND_BONDED) {
             ImageView deviceDetails = (ImageView) view.findViewById(R.id.settings_button);
+            deviceDetails.setContentDescription(
+                    getContext().getResources().getString(
+                            R.string.device_detail_icon_content_description, getTitle()));
 
             if (deviceDetails != null) {
                 deviceDetails.setOnClickListener(this);