Removed "flavour" option in 'board attach' command

cli/board/attach.go

@@ -39,15 +39,12 @@ func initAttachCommand() *cobra.Command {
 		Args: cobra.RangeArgs(1, 2),
 		Run:  runAttachCommand,
 	}
-	attachCommand.Flags().StringVar(&attachFlags.boardFlavour, "flavour", "default",
-		"The Name of the CPU flavour, it is required for some boards (e.g. Arduino Nano).")
 	attachCommand.Flags().StringVar(&attachFlags.searchTimeout, "timeout", "5s",
 		"The timeout of the search of connected devices, try to high it if your board is not found (e.g. to 10s).")
 	return attachCommand
 }
 
 var attachFlags struct {
-	boardFlavour  string // The flavor of the chipset of the cpu of the connected board, if not specified it is set to "default".
 	searchTimeout string // Expressed in a parsable duration, is the timeout for the list and attach commands.
 }
 
@@ -61,7 +58,6 @@ func runAttachCommand(cmd *cobra.Command, args []string) {
 		Instance:      instance,
 		BoardUri:      args[0],
 		SketchPath:    path,
-		BoardFlavour:  attachFlags.boardFlavour,
 		SearchTimeout: attachFlags.searchTimeout,
 	}, cli.OutputTaskProgress())
 	if err != nil {

rpc/board.proto

@@ -56,8 +56,7 @@ message BoardAttachReq {
   Instance instance = 1;
   string board_uri = 2;
   string sketch_path = 3;
-  string board_flavour = 4;
-  string search_timeout = 5;
+  string search_timeout = 4;
 }
 
 message BoardAttachResp {