PATCH: add pio_speed

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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 */
-
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