ipmi:ssif: Increase the message retry time

[ Upstream commit 39721d62 ]

The spec states that the minimum message retry time is 60ms, but it was
set to 20ms.  Correct it.

Reported by: Tony Camuso <tcamuso@redhat.com>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
Stable-dep-of: 00bb7e76 ("ipmi:ssif: Add a timer between request retries")
Signed-off-by: Sasha Levin <sashal@kernel.org>