Add access to the adv type of remote device

Adds new method `uint8_t NimBLEAdvertisedDevice::getAdvType()`
to get the advertisement type of the found device.

src/nimconfig.h

@@ -115,7 +115,9 @@
 #define CONFIG_BT_NIMBLE_L2CAP_COC_MAX_NUM 0
 
 /** Do not comment out */
+#ifndef CONFIG_BT_ENABLED
 #define CONFIG_BT_ENABLED
+#endif
 #define CONFIG_BTDM_CONTROLLER_MODE_BLE_ONLY
 #define CONFIG_BT_NIMBLE_MEM_ALLOC_MODE_INTERNAL