ipmi:ssif: Increase the message retry time

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>

drivers/char/ipmi/ipmi_ssif.c

@@ -74,7 +74,7 @@
 /*
  * Timer values
  */
-#define SSIF_MSG_USEC		20000	/* 20ms between message tries. */
+#define SSIF_MSG_USEC		60000	/* 60ms between message tries. */
 #define SSIF_MSG_PART_USEC	5000	/* 5ms for a message part */
 
 /* How many times to we retry sending/receiving the message. */