PATCH: add pio_speed

[Alan Cox]

Some drivers need this. Its in the core as the core eventually needs to
be doing the tracking here

diff -u --new-file --recursive --exclude-from /usr/src/exclude linux-2.5.61/include/linux/ide.h linux-2.5.61-ac2/include/linux/ide.h
--- linux-2.5.61/include/linux/ide.h	2003-02-10 18:38:20.000000000 +0000
+++ linux-2.5.61-ac2/include/linux/ide.h	2003-02-18 18:02:56.000000000 +0000
@@ -770,6 +760,7 @@
         u8	quirk_list;	/* considered quirky, set for a specific host */
         u8	suspend_reset;	/* drive suspend mode flag, soft-reset recovers */
         u8	init_speed;	/* transfer rate set at boot */
+        u8	pio_speed;      /* unused by core, used by some drivers for fallback from DMA */
         u8	current_speed;	/* current transfer rate set */
         u8	dn;		/* now wide spread use */
         u8	wcache;		/* status of write cache */