arch/arm: add missing itm_syslog.h include

add missing itm_syslog.h include for archs that use itm_syslog_initialize()
to fix compiler errors:

  error: implicit declaration of function 'itm_syslog_initialize'

Issue reported by rentzboy in https://github.com/apache/nuttx/issues/16017

Signed-off-by: raiden00pl <raiden00@railab.me>

arch/arm/src/at32/at32_start.c

@@ -30,6 +30,7 @@
 #include <debug.h>
 #include <nuttx/init.h>
 #include "arm_internal.h"
+#include "itm_syslog.h"
 #include "nvic.h"
 #include "mpu.h"
 

arch/arm/src/cxd32xx/cxd32_start.c

@@ -37,6 +37,7 @@
 
 #include "chip.h"
 #include "arm_internal.h"
+#include "itm_syslog.h"
 #include "init/init.h"
 
 #include "cxd32_uart.h"

arch/arm/src/eoss3/eoss3_start.c

@@ -32,6 +32,7 @@
 #include <nuttx/init.h>
 
 #include "arm_internal.h"
+#include "itm_syslog.h"
 #include "nvic.h"
 #include "nuttx/irq.h"
 

arch/arm/src/gd32f4/gd32f4xx_start.c

@@ -33,6 +33,7 @@
 #include <nuttx/init.h>
 
 #include "arm_internal.h"
+#include "itm_syslog.h"
 #include "nvic.h"
 #include "mpu.h"
 

arch/arm/src/stm32/stm32_start.c

@@ -34,6 +34,7 @@
 
 #include "arch/board/board.h"
 #include "arm_internal.h"
+#include "itm_syslog.h"
 #include "nvic.h"
 #include "mpu.h"
 

arch/arm/src/stm32f7/stm32_start.c

@@ -36,6 +36,7 @@
 #include <arch/board/board.h>
 
 #include "arm_internal.h"
+#include "itm_syslog.h"
 #include "nvic.h"
 #include "mpu.h"