gn2bp: Add sdk_version to the Module

Test: ./update_results.sh
Change-Id: I1c52abe1da8f91426c58dd53f88acecf24b6567b
diff --git a/tools/gn2bp/gen_android_bp b/tools/gn2bp/gen_android_bp
index 76b7a60..247d494 100755
--- a/tools/gn2bp/gen_android_bp
+++ b/tools/gn2bp/gen_android_bp
@@ -320,6 +320,7 @@
     self.aidl = dict()
     self.plugins = set()
     self.processor_class = None
+    self.sdk_version = None
 
   def to_string(self, output):
     if self.comment:
@@ -372,6 +373,7 @@
     self._output_field(output, 'aidl')
     self._output_field(output, 'plugins')
     self._output_field(output, 'processor_class')
+    self._output_field(output, 'sdk_version')
     if self.rtti:
       self._output_field(output, 'rtti')