gn2bp: Move output arg to VersionSanitizer

Test: ./update_results.sh
Change-Id: I98a3135831ac5b46cfec9d32b75c1296ba8c5e35
diff --git a/tools/gn2bp/gen_android_bp b/tools/gn2bp/gen_android_bp
index e3df3c4..55f5ab5 100755
--- a/tools/gn2bp/gen_android_bp
+++ b/tools/gn2bp/gen_android_bp
@@ -760,6 +760,7 @@
 
 class VersionSanitizer(BaseActionSanitizer):
   def get_args(self):
+    self._set_value_arg('-o', '$(out)')
     return super().get_args()
 
 def get_action_sanitizer(target):
@@ -843,8 +844,6 @@
         # arg for -e EVAL option should be passed in -e PATCH_HI=int(PATCH)//256 format.
         target.args[i + 1] = '%s=\'%s\'' % (target.args[i + 1], target.args[i + 2])
         target.args[i + 2] = ''
-      elif val == '-o':
-        target.args[i + 1] = '$(out)'
 
   script = gn_utils.label_to_path(target.script)
   module.tool_files.add(script)