Resolve circular include dependencies

Zephyr kernel is dependend on trace.
Trace is dependend on segger rtt.
Segger rtt MUST NOT be dependend on zephyr kernel.

Move lock functions from header into c file to avoid circular
dependency.

Fixes #43887.

Signed-off-by: Christoph Coenen <[email protected]>

Author: ccoenenatbaumer

Config/SEGGER_RTT_Conf.h

@@ -147,15 +147,17 @@ Revision: $Rev: 21386 $
 */
 #if ((defined(__SES_ARM) || defined(__SES_RISCV) || defined(__CROSSWORKS_ARM) || defined(__GNUC__) || defined(__clang__)) && !defined (__CC_ARM) && !defined(WIN32))
   #if defined(__ZEPHYR__) && defined (CONFIG_SEGGER_RTT_CUSTOM_LOCKING)
-    #include <zephyr/kernel.h>
     #ifdef CONFIG_MULTITHREADING
-      extern struct k_mutex rtt_term_mutex;
-      #define SEGGER_RTT_LOCK() k_mutex_lock(&rtt_term_mutex, K_FOREVER);
-      #define SEGGER_RTT_UNLOCK() k_mutex_unlock(&rtt_term_mutex);
+      extern void zephyr_rtt_mutex_lock(void);
+      extern void zephyr_rtt_mutex_unlock(void);
+      #define SEGGER_RTT_LOCK() zephyr_rtt_mutex_lock()
+      #define SEGGER_RTT_UNLOCK() zephyr_rtt_mutex_unlock()
     #else
+      extern unsigned int zephyr_rtt_irq_lock(void);
+      extern void zephyr_rtt_irq_unlock(unsigned int key);
       #define SEGGER_RTT_LOCK() { \
-        unsigned int key = irq_lock()
-      #define SEGGER_RTT_UNLOCK() irq_unlock(key); \
+        unsigned int key = zephyr_rtt_irq_lock()
+      #define SEGGER_RTT_UNLOCK() zephyr_rtt_irq_unlock(key); \
         }
     #endif
     #define RTT_USE_ASM 0