move HDIO_* ioctls support from <linux/hdreg.h> to <linux/hdio_ioctls.h>

---
* against previous ATA_ID_*, ATA_CMD_* and ATA_* patchsets
* yes, this one also lacks proper description aka patch #0/0 but it is the last one so it is not worth doing it now ;)

 include/linux/Kbuild        |    1 
 include/linux/hdio_ioctls.h |  213 ++++++++++++++++++++++++++++++++++++++++++++
 include/linux/hdreg.h       |  211 -------------------------------------------
 3 files changed, 215 insertions(+), 210 deletions(-)

Index: b/include/linux/Kbuild
===================================================================
@@ -210,6 +210,7 @@ unifdef-y += fs.h
 unifdef-y += gameport.h
 unifdef-y += generic_serial.h
 unifdef-y += hayesesp.h
+unifdef-y += hdio_ioctls.h
 unifdef-y += hdlcdrv.h
 unifdef-y += hdlc.h
 unifdef-y += hdreg.h