Revert "i3c: master: add enable(disable) hot join in sys entry"

This reverts commit 4fa1dfad which is
commit 317bacf9 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: I536822f1c050c517e1b45af64c0703bd3f18bba4
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>