i2c-demo: fix cmakelists overlay path

Signed-off-by: Dhruva Gole <[email protected]>

Author: DhruvaG2000

samples/i2cdemo/CMakeLists.txt

@@ -1,8 +1,8 @@
 # SPDX-License-Identifier: Apache-2.0
 
 cmake_minimum_required(VERSION 3.20.0)
-set(DTC_OVERLAY_FILE $ENV{HOME}/zephyrproject/modules/lib/Arduino-Zephyr-API/variants/ARDUINO_NANO_33_BLE/arduino_nano_33_ble.overlay)
 
+set(DTC_OVERLAY_FILE $ENV{ZEPHYR_BASE}/../modules/lib/Arduino-Zephyr-API/variants/${BOARD}/${BOARD}.overlay)
 find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
 project(blinky)