Add a hook to allow board-specific PIO mode setting.

This patch adds a hook whereby a board-specific routine can be called to
configure hardware for a PIO mode.  The prototype for the board-specific
routine is:

	int inline ide_set_piomode(int pio_mode)

ide_set_piomode should be prepared to configure hardware for a pio_mode
between 0 and 6, inclusive.  It should return 0 on success or 1 on failure.

Signed-off-by: Steven A. Falco <sfalco@harris.com>
diff --git a/include/ata.h b/include/ata.h
index b669423..2396769 100644
--- a/include/ata.h
+++ b/include/ata.h
@@ -236,7 +236,9 @@
 	unsigned short	words130_155[26];/* reserved vendor words 130-155 */
 	unsigned short	word156;
 	unsigned short	words157_159[3];/* reserved vendor words 157-159 */
-	unsigned short	words160_255[95];/* reserved words 160-255 */
+	unsigned short	words160_162[3];/* reserved words 160-162 */
+	unsigned short	cf_advanced_caps;
+	unsigned short	words164_255[92];/* reserved words 164-255 */
 } hd_driveid_t;