Update native getDisplayDecorationSupport API

I27f119f927b23052c5fd8f068cbca75338fe7b91 adds new HAL APIs which
provide more detailed info regarding DISPLAY_DECORATION support. Call
the new API and plumb it up to SurfaceComposerClient.

Remove reference to old DisplayCapability.DISPLAY_DECORATION.

Bug: 216644902
Test: manual
Change-Id: I961051c0a660b596039ac04b546040764ee20d34
diff --git a/services/surfaceflinger/DisplayHardware/HWC2.cpp b/services/surfaceflinger/DisplayHardware/HWC2.cpp
index b59b333..50a6604 100644
--- a/services/surfaceflinger/DisplayHardware/HWC2.cpp
+++ b/services/surfaceflinger/DisplayHardware/HWC2.cpp
@@ -581,6 +581,13 @@
     return static_cast<Error>(error);
 }
 
+Error Display::getDisplayDecorationSupport(
+        std::optional<aidl::android::hardware::graphics::common::DisplayDecorationSupport>*
+                support) {
+    const auto error = mComposer.getDisplayDecorationSupport(mId, support);
+    return static_cast<Error>(error);
+}
+
 // For use by Device
 
 void Display::setConnected(bool connected) {