Refactor SmsListPreference into AppListPreference.

This generalizes the pattern of needing to offer a selection among a
list of candidate applications.

Also move some reusable logic around querying PackageManager for icons
into AppListPreference, and remove some unnecessary update logic: the
preference will update itself when onPreferenceChange returns true,
and we can set the summary to '%s' to automatically use the entry as
the summary without having to reset it each time.

Change-Id: I007b9ed58359302f93b367a4b86354e93613bf3e

res/xml/wireless_settings.xml

@@ -23,9 +23,10 @@
         android:persistent="false"
         android:disableDependentsState="true" />
 
-    <com.android.settings.SmsListPreference
+    <com.android.settings.AppListPreference
         android:key="sms_application"
         android:title="@string/sms_application_title"
+        android:summary="%s"
         android:persistent="false" />
 
     <CheckBoxPreference