samples: sensor: change to use the app.overlay file

The DTC_OVERLAY_FILE variable is specified on the command line.
It's not preferable to set it in CMakeLists.txt.
The app.overlay file is used as the default overlay file, so use it.

Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@fujitsu.com>

samples/sensor/ams_iAQcore/CMakeLists.txt

@@ -2,8 +2,6 @@
 
 cmake_minimum_required(VERSION 3.20.0)
 
-set(DTC_OVERLAY_FILE "${CMAKE_CURRENT_SOURCE_DIR}/iaq_core.overlay")
-
 find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
 project(iAQcore)
 

samples/sensor/ams_iAQcore/README.rst

@@ -14,7 +14,7 @@ Building and Running
 ********************
 
 This sample application uses the sensor connected to the i2c stated in the
-iaq_core.overlay file.
+app.overlay file.
 Flash the binary to a board of choice with a sensor connected.
 This sample can run on every board with i2c.
 For example build for a nucleo_f446re board:

samples/sensor/ens210/CMakeLists.txt

@@ -2,8 +2,6 @@
 
 cmake_minimum_required(VERSION 3.20.0)
 
-set(DTC_OVERLAY_FILE "${CMAKE_CURRENT_SOURCE_DIR}/ens210.overlay")
-
 find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
 project(ens210)
 

samples/sensor/ens210/README.rst

@@ -13,7 +13,7 @@ Building and Running
 ********************
 
 This sample application uses the sensor connected to the i2c stated in the
-ens210.overlay file.
+app.overlay file.
 Flash the binary to a board of choice with a sensor connected.
 For example build for a nucleo_f446re board: