linux-imx

ipmi: constify some struct and char arrays

Lots of char arrays could be set as const since they contain only literal
char arrays.
We could in the same time make const some struct members who are pointer
to those const char arrays.

Signed-off-by: LABBE Corentin <clabbe.montjoie@gmail.com>
Signed-off-by: Corey Minyard <cminyard@mvista.com>