cpu/atmega32u4: Clean up

- Drop duplicated `cpu.c` and `cpu_conf.h`: Those are already provided by
  `cpu/atmega_common`.
- The higher values for default stack size of `cpu_conf.h` in
  `cpu/atmega_common` results in three tests no longer fitting the available RAM
  ==> Updated the Makefile.ci to skip linking of those tests for the Arduino
      Leonardo

cpu/atmega32u4/cpu.c

@@ -1,30 +0,0 @@
-/*
- * Copyright (C) 2017 Thomas Perrot <thomas.perrot@tupi.fr>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- */
-
-/**
- * @ingroup     cpu_atmega32u4
- * @{
- *
- * @file
- * @brief       Implementation of the CPU initialization
- *
- * @author      Thomas Perrot <thomas.perrot@tupi.fr>
- * @}
- */
-
-#include "cpu.h"
-#include "periph/init.h"
-
-/**
- * @brief Initialize the CPU, set IRQ priorities
- */
-void cpu_init(void)
-{
-    /* trigger static peripheral initialization */
-    periph_init();
-}

cpu/atmega32u4/include/cpu_conf.h

@@ -1,52 +0,0 @@
-/*
- * Copyright (C) 2017 Thomas Perrot <thomas.perrot@tupi.fr>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- */
-
-/**
- * @ingroup         cpu_atmega32u4
- * @{
- *
- * @file
- * @brief           Implementation specific CPU configuration options
- *
- * @author          Thomas Perrot <thomas.perrot@tupi.fr>
- *
- */
-
-#ifndef CPU_CONF_H
-#define CPU_CONF_H
-
-#include "atmega_regs_common.h"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/**
- * @name Kernel configuration
- *
- * Since printf seems to get memory allocated by the linker/avr-libc the stack
- * size tested successfully even with pretty small stacks.k
- * @{
- */
-#define THREAD_EXTRA_STACKSIZE_PRINTF    (128)
-
-#ifndef THREAD_STACKSIZE_DEFAULT
-#define THREAD_STACKSIZE_DEFAULT   (256)
-#endif
-
-#ifndef THREAD_STACKSIZE_IDLE
-#define THREAD_STACKSIZE_IDLE      (128)
-#endif
-/** @} */
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* CPU_CONF_H */
-/** @} */

tests/pthread_flood/Makefile.ci

@@ -1,5 +1,6 @@
 BOARD_INSUFFICIENT_MEMORY := \
     arduino-duemilanove \
+    arduino-leonardo \
     arduino-nano \
     arduino-uno \
     atmega328p \

tests/sys_irq_handler/Makefile.ci

@@ -1,5 +1,6 @@
 BOARD_INSUFFICIENT_MEMORY := \
     arduino-duemilanove \
+    arduino-leonardo \
     arduino-nano \
     arduino-uno \
     atmega328p \

tests/ztimer_msg/Makefile.ci

@@ -1,5 +1,6 @@
 BOARD_INSUFFICIENT_MEMORY := \
     arduino-duemilanove \
+    arduino-leonardo \
     arduino-nano \
     arduino-uno \
     atmega328p \