Frameworks: Fix Binder.joinThreadPool

Fix the lack of a native implementation.

(cherry picked from commit acd1987950d54afef1f69dad11840996c22cb8fe)

Bug: 75254055
Bug: 75291614
Test: atest BinderTest
Merged-In: Id5b15442a59851e566a24d406a7487f9de66d42f
Change-Id: Id5b15442a59851e566a24d406a7487f9de66d42f
1 file changed