Fix bpfmt issues and add bpfmt to preupload checks

Test: m nothing
Change-Id: I10526a33685335bdd26cc7692815133379d4e0f6
diff --git a/cmd/extract_apks/Android.bp b/cmd/extract_apks/Android.bp
index 90548cd..f8fe864 100644
--- a/cmd/extract_apks/Android.bp
+++ b/cmd/extract_apks/Android.bp
@@ -6,7 +6,7 @@
         "golang-protobuf-proto",
         "soong-cmd-extract_apks-proto",
     ],
-    testSrcs: ["main_test.go"]
+    testSrcs: ["main_test.go"],
 }
 
 bootstrap_go_package {