mmc: Separate out protocol ops

Move protocol operations and definitions into their own files
in an effort to separate protocol handling and bus
arbitration more clearly.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

drivers/mmc/card/block.c

@@ -32,8 +32,8 @@
 
 #include <linux/mmc/card.h>
 #include <linux/mmc/host.h>
-#include <linux/mmc/protocol.h>
-#include <linux/mmc/host.h>
+#include <linux/mmc/mmc.h>
+#include <linux/mmc/sd.h>
 
 #include <asm/system.h>
 #include <asm/uaccess.h>