display: fix binder interface for setExtOrientation

Add missing hook b/w the binder client and service for
setting EXTERNAL_ORIENTATION

Change-Id: If6084031793251cca16b926bd82f5dccf76468a1
diff --git a/libhwcomposer/hwc_qclient.cpp b/libhwcomposer/hwc_qclient.cpp
index 65667bd..b27a88c 100644
--- a/libhwcomposer/hwc_qclient.cpp
+++ b/libhwcomposer/hwc_qclient.cpp
@@ -61,6 +61,9 @@
         case IQService::SCREEN_REFRESH:
             return screenRefresh();
             break;
+        case IQService::EXTERNAL_ORIENTATION:
+            setExtOrientation(value);
+            break;
         default:
             return NO_ERROR;
     }