ipmi: Use regspacings passed as a module parameter

regspacings parameter is currently ignored and the platform data uses a
default value of 0, this has been fixed by setting the appropriate field
in the platform data.

Fixes: 3cd83bac

 ("ipmi: Consolidate the adding of platform devices")
Signed-off-by: Emilio Perez <emiliopeju@gmail.com>
Message-Id: <20231122203433.443098-1-emiliopeju@gmail.com>
Signed-off-by: Corey Minyard <minyard@acm.org>