Make sure ANATIVEWINDOW_QUERY_BUFFER_AGE is identified as VNDK API.

Previously when we switch to only expose VNDK header, the
ANativeWindow_query doesn't properly recognize
ANATIVEWINDOW_QUERY_BUFFER_AGE as a VNDK query and hence a -EINVAL was
returned. This patch makes sure it is identified and skipped to complete
the actual query.

Bug: b/189551931
Test: manual
Change-Id: I9d4ef74dec3315e661e5a01e7b34a9f97f41fe78
diff --git a/libs/nativewindow/ANativeWindow.cpp b/libs/nativewindow/ANativeWindow.cpp
index ada689a..75f2385 100644
--- a/libs/nativewindow/ANativeWindow.cpp
+++ b/libs/nativewindow/ANativeWindow.cpp
@@ -213,6 +213,7 @@
         case ANATIVEWINDOW_QUERY_DEFAULT_WIDTH:
         case ANATIVEWINDOW_QUERY_DEFAULT_HEIGHT:
         case ANATIVEWINDOW_QUERY_TRANSFORM_HINT:
+        case ANATIVEWINDOW_QUERY_BUFFER_AGE:
             // these are part of the VNDK API
             break;
         case ANATIVEWINDOW_QUERY_MIN_SWAP_INTERVAL: