Migrate uses of config_windowIsRound to Configuration.isScreenRound

Move existing code that previously relied on config_windowIsRound to
use the new Configuration.isScreenRound() method. Also move the system
property override for emulators over to the initial setup of a Display
so that the configuration property is consistent with existing
expectations.

Remove config_windowIsRound from symbols.xml. The symbol now only
exists as a default value redirect for overlays already configured to
supply this value.

Change-Id: I24e6564030a6051c3ac7262868983b43e13eee65
diff --git a/services/core/java/com/android/server/policy/PhoneWindowManager.java b/services/core/java/com/android/server/policy/PhoneWindowManager.java
index 185ef03..a4e9c68 100644
--- a/services/core/java/com/android/server/policy/PhoneWindowManager.java
+++ b/services/core/java/com/android/server/policy/PhoneWindowManager.java
@@ -1220,9 +1220,7 @@
     };
 
     private boolean isRoundWindow() {
-        return mContext.getResources().getBoolean(com.android.internal.R.bool.config_windowIsRound)
-                || (Build.HARDWARE.contains("goldfish")
-                && SystemProperties.getBoolean(ViewRootImpl.PROPERTY_EMULATOR_CIRCULAR, false));
+        return mContext.getResources().getConfiguration().isScreenRound();
     }
 
     /** {@inheritDoc} */