Add OemRouter facility.

OemRouter adds a facility to register OEM Group Message handlers,
then dispatch matching messages to the registered handler.
Added as a core source so that any dynamic provider can register its
messages without requiring any specific load order.

Includes code fixes for x86 portability.

Change-Id: I47b8fe7873e3c7fdf35a00d3c8a7e17d30c398c4
Signed-off-by: Peter Hanson <peterh@google.com>
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/host-ipmid/ipmid-api.h b/host-ipmid/ipmid-api.h
index 5a2e81d..1bec851 100644
--- a/host-ipmid/ipmid-api.h
+++ b/host-ipmid/ipmid-api.h
@@ -93,6 +93,7 @@
     NETFUN_STORAGE   =   0x0a,
     NETFUN_TRANSPORT =   0x0c,
     NETFUN_GRPEXT    =   0x2c,
+    NETFUN_OEM_GROUP =   0x2e,
     NETFUN_NONE      =   0x30,
     NETFUN_OEM       =   0x32,
     NETFUN_IBM_OEM   =   0x3A