Sort hiddenapi-light-greylist.txt

Previous CL Ide42eacc8db4e403432ddd9d952495dda85db0ac left it
unsorted which makes it difficult to programatically add new APIs.

Bug: 64382372
Test: make
Change-Id: Iff35925d9ad64d8a98e59c1b8c4094d59a1c3a3c
1 file changed