[VTS] Update RenderEngine dependencies.

Upstream change adds a new RenderEngine dependency, adding the dependency
here to fix compilation issue.

Bug: 136806342
Bug: 137191934
Test: builds
Change-Id: I8c097dd162afb79d36269741af00d0e69cf77c2a
diff --git a/graphics/composer/2.2/vts/functional/Android.bp b/graphics/composer/2.2/vts/functional/Android.bp
index cc24774..1319035 100644
--- a/graphics/composer/2.2/vts/functional/Android.bp
+++ b/graphics/composer/2.2/vts/functional/Android.bp
@@ -29,6 +29,7 @@
         "libhidlbase",
         "libhidltransport",
         "libhwbinder",
+        "libprocessgroup",
         "libsync",
         "libui",
         "libgui",