Allow nullable after API dump.

Since this affects the C++/NDK type, but not the Java type or wire
protocol.

Bug: 146215188
Test: CtsNdkBinderTestCases
(cherry picked from commit 7b6a7d9c31afa27c444ba6c3827423750441bc3c)
Merged-In: I151ae0758dc1edcba99680a996706ce9b0a7ac58
Change-Id: I155cc900fcea0d44e0704d3f8fedfe9efd0d6f69
1 file changed