ata/sata_fsl: Remove unnecessary SCR cases

SCRs in the driver map to the standard values found in include/linux/ata.h,
so no need for individual scr_read/scr_write case statements duplicating
the natural value.

Signed-off-by: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Li Yang <leoli@freescale.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/ata/sata_fsl.c b/drivers/ata/sata_fsl.c
index 9e99cc8..e04fb75 100644
--- a/drivers/ata/sata_fsl.c
+++ b/drivers/ata/sata_fsl.c
@@ -472,16 +472,10 @@
 
 	switch (sc_reg_in) {
 	case SCR_STATUS:
-		sc_reg = 0;
-		break;
 	case SCR_ERROR:
-		sc_reg = 1;
-		break;
 	case SCR_CONTROL:
-		sc_reg = 2;
-		break;
 	case SCR_ACTIVE:
-		sc_reg = 3;
+		sc_reg = sc_reg_in;
 		break;
 	default:
 		return -EINVAL;
@@ -502,16 +496,10 @@
 
 	switch (sc_reg_in) {
 	case SCR_STATUS:
-		sc_reg = 0;
-		break;
 	case SCR_ERROR:
-		sc_reg = 1;
-		break;
 	case SCR_CONTROL:
-		sc_reg = 2;
-		break;
 	case SCR_ACTIVE:
-		sc_reg = 3;
+		sc_reg = sc_reg_in;
 		break;
 	default:
 		return -EINVAL;