Add type information to symbolfile and ndkstubgen.

Test: mypy symbolfile
Test: pytest
Bug: None
Change-Id: I6b1045d315e5a10e699d31de9fafc084d82768b2
diff --git a/cc/ndkstubgen/mypy.ini b/cc/ndkstubgen/mypy.ini
new file mode 100644
index 0000000..82aa7eb
--- /dev/null
+++ b/cc/ndkstubgen/mypy.ini
@@ -0,0 +1,2 @@
+[mypy]
+disallow_untyped_defs = True