[nrf52] prepare for usb cdc (#14174)

Co-authored-by: Jonathan Swoboda <154711427+swoboda1337@users.noreply.github.com>

esphome/components/esp32/__init__.py

@@ -464,6 +464,8 @@ def only_on_variant(*, supported=None, unsupported=None, msg_prefix="This featur
         unsupported = [unsupported]
 
     def validator_(obj):
+        if not CORE.is_esp32:
+            raise cv.Invalid(f"{msg_prefix} is only available on ESP32")
         variant = get_esp32_variant()
         if supported is not None and variant not in supported:
             raise cv.Invalid(

esphome/core/event_pool.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#if defined(USE_ESP32)
+#if defined(USE_ESP32) || defined(USE_ZEPHYR)
 
 #include <atomic>
 #include <cstddef>