Add support of ESP32C6 to OTBR example

Author: alexbegoon

.gitignore

@@ -11,3 +11,5 @@ out/
 _build/
 tools/chip-tool/
 .zap/
+.idea
+cmake-build-*

examples/thread_border_router/CMakeLists.txt

@@ -9,6 +9,8 @@ endif(NOT DEFINED ENV{ESP_MATTER_PATH})
 if(NOT DEFINED ENV{ESP_MATTER_DEVICE_PATH})
     if("${IDF_TARGET}" STREQUAL "esp32s3")
         set(ENV{ESP_MATTER_DEVICE_PATH} $ENV{ESP_MATTER_PATH}/device_hal/device/esp32s3_devkit_c)
+    elseif ("${IDF_TARGET}" STREQUAL "esp32c6")
+        set(ENV{ESP_MATTER_DEVICE_PATH} $ENV{ESP_MATTER_PATH}/device_hal/device/esp32c6_devkit_c)
     else()
         message(FATAL_ERROR "Unsupported IDF_TARGET")
     endif()

examples/thread_border_router/README.md

@@ -9,7 +9,7 @@ See the [docs](https://docs.espressif.com/projects/esp-matter/en/latest/esp32/de
 
 ### 1.1 Hardware Platform
 
-The [ESP Thread Border Router board](https://github.com/espressif/esp-thread-br?tab=readme-ov-file#esp-thread-border-router-board) which provides an integrated module of an ESP32-S3 and an ESP32-H2 is required for this example.
+The [ESP Thread Border Router board](https://github.com/espressif/esp-thread-br?tab=readme-ov-file#esp-thread-border-router-board) which provides an integrated module of an ESP32-S3 and an ESP32-H2 is required for this example. Alternatively, the ESP32-S3 and ESP32-H2 might be replaced by the ESP32-C6.
 
 ### 1.2 Firmware for RCP