[Ongoing Call Chip] Add 5dp of start margin.

Fixes: 204042265
Test: Manual (see screenshots in b/204042265#comment4)
Change-Id: Ifa2d8bad1d9e96bf906dc73aff0aedb3728754ca

packages/SystemUI/res/layout/ongoing_call_chip.xml

@@ -21,6 +21,7 @@
     android:layout_width="wrap_content"
     android:layout_height="match_parent"
     android:layout_gravity="center_vertical|start"
+    android:layout_marginStart="5dp"
 >
     <LinearLayout
         android:id="@+id/ongoing_call_chip_background"