ipmi: Convert printk(KERN_<level> to pr_<level>(

Use the more common logging style.

Miscellanea:

o Convert old style continuation printks without KERN_CONT to pr_cont
o Coalesce formats
o Realign arguments
o Remove unnecessary casts

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Corey Minyard <cminyard@mvista.com>