sata.h: Make all sata/ata drivers include <sata.h>

- block_dev_desc_t says that block_(read|write) take lbaint_t for blkcnt
  not ulong.
- We also move the extern of sata_dev_desc into <sata.h>
- Remove now duplicate declarations from driver-specific headers.

Signed-off-by: Tom Rini <trini@ti.com>
Signed-off-by: Pavel Herrmann <morpheus.ibis@gmail.com>
diff --git a/drivers/block/ata_piix.c b/drivers/block/ata_piix.c
index dd411f1..1e33a66 100644
--- a/drivers/block/ata_piix.c
+++ b/drivers/block/ata_piix.c
@@ -34,9 +34,7 @@
 #include <part.h>
 #include <ide.h>
 #include <ata.h>
-
-extern block_dev_desc_t sata_dev_desc[CONFIG_SYS_SATA_MAX_DEVICE];
-extern int sata_curr_device;
+#include <sata.h>
 
 #define DEBUG_SATA 0		/* For debug prints set DEBUG_SATA to 1 */