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/drivers/block/sym53c8xx.c b/drivers/block/sym53c8xx.c
index c7c40af..5daede7 100644
--- a/drivers/block/sym53c8xx.c
+++ b/drivers/block/sym53c8xx.c
@@ -33,7 +33,7 @@
 #define PRINTF(fmt,args...)
 #endif
 
-#if defined(CONFIG_CMD_SCSI) && defined(CONFIG_SCSI_SYM53C8XX)
+#if defined(CONFIG_SCSI) && defined(CONFIG_SCSI_SYM53C8XX)
 
 #undef SCSI_SINGLE_STEP
 /*