ipmi: Remove useless sysfs_name parameters

It was always "bmc", so just hardcode it.  It makes no sense to
pass that in.

Signed-off-by: Corey Minyard <cminyard@mvista.com>

diff --cc drivers/char/ipmi/ipmi_msghandler.c
Simple merge

diff --cc drivers/char/ipmi/ipmi_si_intf.c
Simple merge

diff --cc include/linux/ipmi_smi.h
Simple merge