Consolidate 3 phone icons into one.

ic_bt_cellphone, ic_volume_voice, ic_phone_24dp -> ic_phone

Bug: 122263617
Test: make
Change-Id: Id3a518209e78d1f51b3cc1945bcbeba1bdcb2e23
diff --git a/packages/SystemUI/res/layout/keyguard_bottom_area.xml b/packages/SystemUI/res/layout/keyguard_bottom_area.xml
index 96a1bab..098c975 100644
--- a/packages/SystemUI/res/layout/keyguard_bottom_area.xml
+++ b/packages/SystemUI/res/layout/keyguard_bottom_area.xml
@@ -78,7 +78,7 @@
         android:layout_height="@dimen/keyguard_affordance_height"
         android:layout_width="@dimen/keyguard_affordance_width"
         android:layout_gravity="bottom|start"
-        android:src="@drawable/ic_phone_24dp"
+        android:src="@*android:drawable/ic_phone"
         android:scaleType="center"
         android:contentDescription="@string/accessibility_phone_button"
         android:tint="?attr/wallpaperTextColor" />