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

This reverts commit 65677e96 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: I89b9f6fe81afc9352343a988fe700ff3b3d62bcd
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>