Revert "i2c: core: Lock address during client device instantiation"

This reverts commit 316be491 which is
commit 8d3cefaf upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: Ib9858d534bbb26acb771c5f7344d8494b86c9b27
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>