[libata] bump versions

Bump versions based on changes submitted during 2.6.21 merge window.

Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index e74e972..c8d44a7 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -59,7 +59,7 @@
 
 #include "libata.h"
 
-#define DRV_VERSION	"2.10"	/* must be exactly four chars */
+#define DRV_VERSION	"2.20"	/* must be exactly four chars */
 
 
 /* debounce timing parameters in msecs { interval, duration, timeout } */