tpm: fix typo in kernel doc

The udevice given to the open() function of course must be opened,
not closed.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

include/tpm-common.h

@@ -71,7 +71,7 @@ struct tpm_ops {
 	 * After all commands have been completed the caller should call
 	 * close().
 	 *
-	 * @dev:	Device to close
+	 * @dev:	Device to open
 	 * @return 0 ok OK, -ve on error
 	 */
 	int (*open)(struct udevice *dev);