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/cmd/disk.c b/cmd/disk.c
index 2fd1717..fcc4123 100644
--- a/cmd/disk.c
+++ b/cmd/disk.c
@@ -8,7 +8,7 @@
 #include <command.h>
 #include <part.h>
 
-#if defined(CONFIG_CMD_IDE) || defined(CONFIG_CMD_SCSI) || \
+#if defined(CONFIG_CMD_IDE) || defined(CONFIG_SCSI) || \
 	defined(CONFIG_USB_STORAGE)
 int common_diskboot(cmd_tbl_t *cmdtp, const char *intf, int argc,
 		    char *const argv[])