Update VNDK version for common graphics HALs.

We are adding things to them, and in order for core libraries like libui
to use them, the newer versions need to be in the VNDK.

Bug: 170435409
Test: build
Change-Id: I84fc02127254c6b9d6d7858e140bd256b0dff44b
diff --git a/services/surfaceflinger/tests/Android.bp b/services/surfaceflinger/tests/Android.bp
index db5d820..02b4308 100644
--- a/services/surfaceflinger/tests/Android.bp
+++ b/services/surfaceflinger/tests/Android.bp
@@ -50,7 +50,7 @@
         "android.hardware.graphics.composer@2.1",
     ],
     shared_libs: [
-        "android.hardware.graphics.common-ndk_platform",
+        "android.hardware.graphics.common-unstable-ndk_platform",
         "android.hardware.graphics.common@1.2",
         "libandroid",
         "libbase",