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/MPC8641HPCN.h b/include/configs/MPC8641HPCN.h
index 5e23007..9b2623c 100644
--- a/include/configs/MPC8641HPCN.h
+++ b/include/configs/MPC8641HPCN.h
@@ -610,7 +610,7 @@
 
 #if defined(CONFIG_PCI)
     #define CONFIG_CMD_PCI
-    #define CONFIG_CMD_SCSI
+    #define CONFIG_SCSI
 #endif
 
 #undef CONFIG_WATCHDOG			/* watchdog disabled */