ide: include <linux/hdreg.h> only when needed

* Include <linux/ata.h> directly in <linux/ide.h>
  instead of through <linux/hdreg.h>.

* Include <linux/hdreg.h> only when needed.

Cc: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/include/linux/ide.h b/include/linux/ide.h
index 1d9716a..a7f980d 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -8,7 +8,7 @@
 
 #include <linux/init.h>
 #include <linux/ioport.h>
-#include <linux/hdreg.h>
+#include <linux/ata.h>
 #include <linux/blkdev.h>
 #include <linux/proc_fs.h>
 #include <linux/interrupt.h>