[zx][rs] Remove AsHandleRef::basic_info.

Replaced by inherent basic_info() methods on handle wrappers.

Change-Id: I2e167eb97954b14dffb1c5d7a0c4dcdf6793ffb6
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1449574
Owners-Override: Adam Barth <abarth@google.com>
Reviewed-by: Adam Barth <abarth@google.com>
Commit-Queue: Adam Perry <adamperry@google.com>
Fuchsia-Auto-Submit: Adam Perry <adamperry@google.com>
37 files changed