libbinder_ndk: mv host tip to binder_status.h

This ifdef warning w/ hint for NDK host users was in binder_ibinder.h.
However, since binder_status.h is always included first, moving it
there.

Fixes: 183160548
Test: N/A
Change-Id: Icd00c7769130026980d6d55fb9bc77b8561e59b3