Updated pinut in variant tlorav2_1_16 (#1365)

* Added the last mac address bytes in bluetooth device name ESP32Bluetooth.cpp
Add default notification pinout to tlora_v2_1_16/variant.h

* updated ADC_MULTIPLIER  value for more accuracy

* Update variant.h

Updated LORA_RESET GPIO in this board is 23
Removed LORA_DIO1 35 , gpio 35 is a battery pin 
Removed LORA_DIO2 34, gpio 34 is unuse in this board

Co-authored-by: Ben Meadors <benmmeadors@gmail.com>
Co-authored-by: Thomas Göttgens <tgoettgens@gmail.com>