soong: Properly sort dumpvar additions

* Minor annoyance - but GMS vars should be together, product
  vars should be together.

Change-Id: I6bd3a7ad2a87aac8dadf5705e60f8eb30c9a8f32
diff --git a/ui/build/dumpvars.go b/ui/build/dumpvars.go
index 50df59b..7fb747c 100644
--- a/ui/build/dumpvars.go
+++ b/ui/build/dumpvars.go
@@ -168,10 +168,10 @@
 	"SOONG_SDK_SNAPSHOT_TARGET_BUILD_RELEASE",
 	"SOONG_SDK_SNAPSHOT_USE_SOURCE_CONFIG_VAR",
 	"SOONG_SDK_SNAPSHOT_VERSION",
+        "PRODUCT_IS_ATV",
+        "PRODUCT_IS_AUTO",
 	"WITH_SU",
 	"WITH_GMS",
-	"PRODUCT_IS_ATV",
-	"PRODUCT_IS_AUTO",
 	"GMS_MAKEFILE",
 	"MAINLINE_MODULES_MAKEFILE",
 }