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

This reverts commit e2852a02 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: I79971fdc8bf43c4d141d5a9780d9c6795da484b9
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>