Revert "Get rid of _t suffix"

In the very least, a change like this requires discussion on the list.

The naming convention is goofy and it causes a massive merge problem.  Something
like this _must_ be presented on the list first so people can provide input
and cope with it.

This reverts commit 99a0949b72.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

hw/sd.h

@@ -57,7 +57,7 @@ typedef enum {
     sd_bcr,	/* broadcast with response */
     sd_ac,	/* addressed -- no data transfer */
     sd_adtc,	/* addressed with data transfer */
-} e_sd_cmd_type;
+} sd_cmd_type_t;
 
 typedef struct {
     uint8_t cmd;