gn2bp: sort target entries

Test: //components/cronet/android:cronet
Change-Id: I31a945db243a9704e678e8093f86267666b8e5e3
diff --git a/tools/gn2bp/gen_android_bp b/tools/gn2bp/gen_android_bp
index 6ff6699..422e126 100755
--- a/tools/gn2bp/gen_android_bp
+++ b/tools/gn2bp/gen_android_bp
@@ -343,7 +343,7 @@
     self._output_field(output, 'arch')
 
     target_out = []
-    for arch, target in self.target.items():
+    for arch, target in sorted(self.target.items()):
       # _output_field calls getattr(self, arch).
       setattr(self, arch, target)
       self._output_field(target_out, arch)