Inline os/linux_generic/queue.tpp into os/queue.h

- The implementation header is not close to
  the definition header, the link is not
  immediately clear
- The namespace declaration is missing
  from the implementation header, which
  further obsucres provenance

Bug: 331817295
Test: m com.android.btservices
Flag: EXEMPT, mechanical refactor
Change-Id: Ib548d4ded9cadf2a249f06392fc0e98efbb5e484