prefs: HW encoding is not considered experimental anymore

Change-Id: I333e89378bdd69d8c36c9e3d453d454c588b914c

ring-android/app/src/main/res/layout/frag_settings.xml

@@ -96,7 +96,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
                     android:layout_height="wrap_content"
                     android:layout_alignParentStart="true"
                     android:layout_centerVertical="true"
-                    android:contentDescription="@string/pref_hwEncode_summary"
                     app:srcCompat="@drawable/baseline_memory_24"
                     android:layout_marginEnd="32dp"/>
 

ring-android/app/src/main/res/xml/tv_account_general_pref.xml

@@ -15,7 +15,6 @@
             android:defaultValue="true"
             android:icon="@drawable/baseline_memory_24"
             android:key="video_hwenc"
-            android:summary="@string/pref_hwEncode_summary"
             android:title="@string/pref_hwEncode_title" />
 
         <ListPreference

ring-android/app/src/main/res/xml/video_prefs.xml

@@ -5,7 +5,6 @@
         android:defaultValue="true"
         android:icon="@drawable/baseline_memory_24"
         android:key="video_hwenc"
-        android:summary="@string/pref_hwEncode_summary"
         android:title="@string/pref_hwEncode_title" />
 
     <ListPreference