fix(wifi):fix modem state rx bcn failed when tbtt update, support modem state for coexist

components/esp_coex/include/private/esp_coexist_internal.h

@@ -396,6 +396,15 @@ int coex_schm_flexible_period_set(uint8_t period);
 uint8_t coex_schm_flexible_period_get(void);
 #endif
 
+/**
+ * @brief     Get coexistence scheme phase by phase index.
+ *
+ * @param     phase_idx    Coexistence phase index
+ *
+ * @return    Coexistence scheme phase
+ */
+void * coex_schm_get_phase_by_idx(int phase_idx);
+
 /**
   * @brief     Check the MD5 values of the coexistence adapter header files in IDF and WiFi library
   *