Fix the format of Android.bp

Test: Build

Change-Id: I539f9bf6e14aa940f899bd16e31352b184bba1b3
diff --git a/Android.bp b/Android.bp
index f719a31..7034daf 100644
--- a/Android.bp
+++ b/Android.bp
@@ -1151,14 +1151,14 @@
 // gRPC python library target
 python_library_host {
     name: "py-grpc",
-    srcs: [ "src/python/**/*.py" ],
+    srcs: ["src/python/**/*.py"],
     version: {
         py2: {
-	    enabled: true,
-	},
-	py3: {
-	    enabled: true,
-	},
+            enabled: true,
+        },
+        py3: {
+            enabled: true,
+        },
     },
-    pkg_path: "grpc"
+    pkg_path: "grpc",
 }