[SCSI] add scsi_reprobe_device

Original from Christoph Hellwig and Eric Moore.  This version exports
the scsi_reprobe_device() function as an inline.
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

include/scsi/scsi_device.h

@@ -293,6 +293,11 @@ extern int scsi_execute_async(struct scsi_device *sdev,
 			      void (*done)(void *, char *, int, int),
 			      gfp_t gfp);
 
+static inline void scsi_device_reprobe(struct scsi_device *sdev)
+{
+	device_reprobe(&sdev->sdev_gendev);
+}
+
 static inline unsigned int sdev_channel(struct scsi_device *sdev)
 {
 	return sdev->channel;