hiddenapi: Accept Unsupported/Sdk conflict

The hiddenapi tool currently doesn't accept a API being labeled as both
Unsupported, as well as part of the Sdk.

In order to enable migrations from UAU to Sdk with flags, this conflict
must be tolerated in the flag enabled case. UAU must remain for the
flag disabled case.

Test: Builds with API with @UAU and @SystemApi
Bug: 358250700
Change-Id: I70821a8c57ec06fe9fd9957da5f4a597a875b1ca
1 file changed