soc: espressif: declare z_cstart

Declare z_cstart as extern as otherwise we will need to pull in
kernel_internal.h.

Signed-off-by: Anas Nashif <[email protected]>

Author: nashif

soc/espressif/esp32c2/soc.c

@@ -16,6 +16,7 @@
 #include <zephyr/arch/common/init.h>
 
 extern void esp_reset_reason_init(void);
+extern FUNC_NORETURN void z_cstart(void);
 
 void IRAM_ATTR __esp_platform_app_start(void)
 {

soc/espressif/esp32c3/soc.c

@@ -17,6 +17,7 @@
 #include <zephyr/arch/common/init.h>
 
 extern void esp_reset_reason_init(void);
+extern FUNC_NORETURN void z_cstart(void);
 
 void IRAM_ATTR __esp_platform_app_start(void)
 {

soc/espressif/esp32c6/soc.c

@@ -16,6 +16,7 @@
 #include <zephyr/arch/common/init.h>
 
 extern void esp_reset_reason_init(void);
+extern FUNC_NORETURN void z_cstart(void);
 
 void IRAM_ATTR __esp_platform_app_start(void)
 {

soc/espressif/esp32c6/soc_lpcore.c

@@ -4,6 +4,7 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+#include <zephyr/toolchain.h>
 #include "soc/soc_caps.h"
 #include "esp_rom_caps.h"
 #include "rom/ets_sys.h"
@@ -14,6 +15,7 @@
 #include <soc.h>
 
 extern void main(void);
+extern FUNC_NORETURN void z_cstart(void);
 
 /* Initialize lp core related system functions before calling user's main*/
 void lp_core_startup(void)