mmc: refactor host class handling

Move basic host class device handling to its own file for clarity.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
diff --git a/drivers/mmc/core/host.h b/drivers/mmc/core/host.h
new file mode 100644
index 0000000..c2dc3d2
--- /dev/null
+++ b/drivers/mmc/core/host.h
@@ -0,0 +1,18 @@
+/*
+ *  linux/drivers/mmc/core/host.h
+ *
+ *  Copyright (C) 2003 Russell King, All Rights Reserved.
+ *  Copyright 2007 Pierre Ossman
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef _MMC_CORE_HOST_H
+#define _MMC_CORE_HOST_H
+
+int mmc_register_host_class(void);
+void mmc_unregister_host_class(void);
+
+#endif
+