feat(openthread): support openthread heap allocation from PSRAM

components/openthread/src/port/esp_openthread_memory.c

@@ -1,10 +1,11 @@
 /*
- * SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2021-2026 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
 
 #include "esp_openthread.h"
+#include "esp_openthread_platform.h"
 
 #include "openthread/platform/memory.h"
 
@@ -12,10 +13,10 @@
 
 void *otPlatCAlloc(size_t num, size_t size)
 {
-    return calloc(num, size);
+    return heap_caps_calloc(num, size, esp_openthread_get_alloc_caps());
 }
 
 void otPlatFree(void *ptr)
 {
-    free(ptr);
+    heap_caps_free(ptr);
 }