Revert "Create soong-generated filesystem diff test"

This reverts commit 2cf1bf5624c8048b960b9e0ec27a7677739049ae.

Reason for revert: <Droidmonitor created revert due to b/371496012. Will be verifying through ABTD before submission.>

Change-Id: Ie9d0e279a3fa6de71427c0f7f9c95990e59c8a6d
diff --git a/fsgen/filesystem_creator_test.go b/fsgen/filesystem_creator_test.go
index 554b66b..6bb0e77 100644
--- a/fsgen/filesystem_creator_test.go
+++ b/fsgen/filesystem_creator_test.go
@@ -44,13 +44,12 @@
 		}),
 		android.FixtureMergeMockFs(android.MockFS{
 			"external/avb/test/data/testkey_rsa4096.pem": nil,
-			"build/soong/fsgen/Android.bp": []byte(`
-			soong_filesystem_creator {
-				name: "foo",
-			}
-			`),
 		}),
-	).RunTest(t)
+	).RunTestWithBp(t, `
+	soong_filesystem_creator {
+		name: "foo",
+	}
+	`)
 
 	fooSystem := result.ModuleForTests("test_product_generated_system_image", "android_common").Module().(interface {
 		FsProps() filesystem.FilesystemProperties