staging: comedi: amplc_dio200: rename enum dio200_layout

Rename `enum dio200_layout` to `enum dio200_layout_idx`.  It's only used
once and frees up the `dio200_layout` tag for something else later.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/amplc_dio200.c

@@ -270,7 +270,7 @@ enum dio200_model {
 	pc272e_model, pci272_model,
 };
 
-enum dio200_layout {
+enum dio200_layout_idx {
 #if DO_ISA
 	pc212_layout,
 	pc214_layout,
@@ -287,7 +287,7 @@ struct dio200_board {
 	unsigned short devid;
 	enum dio200_bustype bustype;
 	enum dio200_model model;
-	enum dio200_layout layout;
+	enum dio200_layout_idx layout;
 };
 
 static const struct dio200_board dio200_boards[] = {