system/irtest: Set irtest command line size to CONFIG_LINE_MAX

Let `irtest` command line size be equal to CONFIG_LINE_MAX so that
bigger (or smaller) commands can be set.

Signed-off-by: Tiago Medicci <tiago.medicci@espressif.com>

Author: tmedicci

system/irtest/main.cxx

@@ -24,11 +24,17 @@
  * Included Files
  ****************************************************************************/
 
+#include <nuttx/config.h>
+
 #include <stdio.h>
 
 #include "system/readline.h"
 #include "cmd.hpp"
 
+#ifndef CONFIG_LINE_MAX
+#  define CONFIG_LINE_MAX 512
+#endif
+
 /****************************************************************************
  * Private Functions
  ****************************************************************************/
@@ -48,7 +54,7 @@ extern "C"
 {
 int main(int argc, char *argv[])
 {
-  char cmdline[512];
+  char cmdline[CONFIG_LINE_MAX];
 
   init_device();