fix ble build issue with esp32c6

Author: mkellner

tools/mcconfig/nmake.esp32.mk

@@ -246,6 +246,7 @@ INC_DIRS = \
 	-I$(IDF_PATH)\components\esp_eth\include \
 	-I$(IDF_PATH)\components\esp_hw_support\include \
 	-I$(IDF_PATH)\components\esp_hw_support\include\soc \
+	-I$(IDF_PATH)\components\esp_hw_support\port\$(ESP32_SUBCLASS)\private_include \
  	-I$(IDF_PATH)\components\esp_lcd\include \
  	-I$(IDF_PATH)\components\esp_netif\include \
  	-I$(IDF_PATH)\components\esp_partition\include \