dm: scsi: Rename CONFIG_CMD_SCSI to CONFIG_SCSI

This option currently enables both the command and the SCSI functionality.
Rename the existing option to CONFIG_SCSI since most of the code relates
to the feature.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/configs/am57xx_evm.h b/include/configs/am57xx_evm.h
index 32d7d4d..d53b0fd 100644
--- a/include/configs/am57xx_evm.h
+++ b/include/configs/am57xx_evm.h
@@ -75,7 +75,7 @@
 
 /* SATA */
 #define CONFIG_BOARD_LATE_INIT
-#define CONFIG_CMD_SCSI
+#define CONFIG_SCSI
 #define CONFIG_LIBATA
 #define CONFIG_SCSI_AHCI
 #define CONFIG_SCSI_AHCI_PLAT