Separate work and personal contacts search result

This change allows sms app to show search result of different directories
in different partitions.
Currently, only personal default and enterprise default directory are
searched.

BUG=26021888
BUG=28016344
(cherry picked from commit 59666b32c192bd28807ccd2f9153c796668bdf13)

Change-Id: I733ceaae806d13661861126ce61c34108ac7e662
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 58af39b..012d87f 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -973,4 +973,6 @@
 
     <!-- The accessibility text read when the sim chooser pops up to read the current selected sim -->
     <string name="selected_sim_content_message"><xliff:g id="selected_sim">%s</xliff:g> selected</string>
+
+    <string name="work_directory_display_name">Work Profile contacts</string>
 </resources>