Remove AndroidTestCase from UnsupportedAppUsage

I8ea5421723a4a40d580956e5ceb51be70253f0eb has made the two APIs in the
class public (though as deprecated). We don't need to put them into the
greylist, which would make the hiddenapi tool uncomfortable.

Bug: 157007292
Test: m on qemu_trusty_arm64
Change-Id: Ibde3f44244fbe0e2c5da596eef05da57a6ee474a