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/common/board_r.c b/common/board_r.c
index ad02549..d959ad3 100644
--- a/common/board_r.c
+++ b/common/board_r.c
@@ -620,7 +620,7 @@
 }
 #endif
 
-#if defined(CONFIG_CMD_SCSI)
+#if defined(CONFIG_SCSI)
 static int initr_scsi(void)
 {
 	puts("SCSI:  ");
@@ -923,7 +923,7 @@
 	initr_ambapp_print,
 #endif
 #endif
-#ifdef CONFIG_CMD_SCSI
+#ifdef CONFIG_SCSI
 	INIT_FUNC_WATCHDOG_RESET
 	initr_scsi,
 #endif