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: I4d60e769ccc5c94ec52588cf189de5bd8dc18f89
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>