ipmi: create hardware-independent softdep for ipmi_devintf

When a computer has an IPMI system interface, the device interface
is most probably also desired. Autoloading of ipmi_devintf currently
works only if ipmi_si has allocated a platform device. That doesn't
happen if the SI interface was detected e.g. via ACPI. But ACPI
detection is preferred these days, see e.g. kernel.org bug 46741.

This patch introduces a softdep in place of the existing modalias
for ipmi_devintf.

Signed-off-by: Martin Wilck <mwilck@suse.com>
Suggested-by: Takashi Iwai <tiwai@suse.com>

I moved this to ipmi_msghandler.c, so it works for all IPMI
interfaces.  Retested by Martin.

Tested-by: Martin Wilck <mwilck@suse.com>
Signed-off-by: Corey Minyard <cminyard@mvista.com>

drivers/char/ipmi/ipmi_devintf.c

@@ -989,4 +989,3 @@ module_exit(cleanup_ipmi);
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>");
 MODULE_DESCRIPTION("Linux device interface for the IPMI message handler.");
-MODULE_ALIAS("platform:ipmi_si");

drivers/char/ipmi/ipmi_msghandler.c

@@ -4646,3 +4646,4 @@ MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>");
 MODULE_DESCRIPTION("Incoming and outgoing message routing for an IPMI"
 		   " interface.");
 MODULE_VERSION(IPMI_DRIVER_VERSION);
+MODULE_SOFTDEP("post: ipmi_devintf");