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

This reverts commit e7217d52 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: Ib63ff458473f5716c84ecfe01f3fd198ad8032eb
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>