make BT core code execution conditional from include esp_bt.h (#11413)

* make code execution conditional from include esp_bt.h.h

* only one if

* Update esp32-hal-bt.c

Author: Jason2866

cores/esp32/esp32-hal-bt.c

@@ -15,7 +15,7 @@
 #include "esp32-hal-bt.h"
 
 #if SOC_BT_SUPPORTED
-#ifdef CONFIG_BT_BLUEDROID_ENABLED
+#if defined(CONFIG_BT_BLUEDROID_ENABLED) && __has_include("esp_bt.h")
 
 #if CONFIG_IDF_TARGET_ESP32
 bool btInUse() {