segger: config: support RTT section custom definition in Zephyr DTS

Support custom RTT section defined as memory region in the DTS, in
addition to the custom RTT section placed by default at RAM start.

Signed-off-by: Giancarlo Stasi <[email protected]>

Author: giansta

Config/SEGGER_RTT_Conf.h

@@ -98,7 +98,7 @@ Revision: $Rev: 24316 $
 #define SEGGER_RTT_SECTION                        ".dtcm_data"
 #elif defined(CONFIG_SEGGER_RTT_SECTION_CCM)
 #define SEGGER_RTT_SECTION                        ".ccm_data"
-#elif defined(CONFIG_SEGGER_RTT_SECTION_CUSTOM)
+#elif defined(CONFIG_SEGGER_RTT_SECTION_CUSTOM) || defined(CONFIG_SEGGER_RTT_SECTION_CUSTOM_DTS_REGION)
 #define SEGGER_RTT_SECTION                        CONFIG_SEGGER_RTT_SECTION_CUSTOM_NAME
 #endif