use COMMAND_REGISTER macro

Replaces direct calls to register_command() with a macro, to allow
its parameters to be changed and callers updated in phases.

src/flash/ecos.c

@@ -338,7 +338,7 @@ static int ecosflash_probe(struct flash_bank *bank)
 
 static int ecosflash_register_commands(struct command_context *cmd_ctx)
 {
-	register_command(cmd_ctx, NULL, "ecosflash", NULL, COMMAND_ANY, NULL);
+	COMMAND_REGISTER(cmd_ctx, NULL, "ecosflash", NULL, COMMAND_ANY, NULL);
 
 	return ERROR_OK;
 }