io/i2c: don't enforce <bus,addr> naming at the driver level

Updates golang/go#15774.

Change-Id: Ieac185e6f409fd93a807fb5c3a0a0629f0a7c29b
Reviewed-on: https://go-review.googlesource.com/23288
Reviewed-by: Minux Ma <minux@golang.org>
Run-TryBot: Jaana Burcu Dogan <jbd@google.com>
5 files changed