make saola as cmake component, easier to add more esp32 board

examples/device/hid_composite_freertos/CMakeLists.txt

@@ -2,13 +2,13 @@
 # CMakeLists in this exact order for cmake to work correctly
 cmake_minimum_required(VERSION 3.5)
 
-# example src directory
-set(EXTRA_COMPONENT_DIRS "src")
-
 # TOP is absolute path to root directory of TinyUSB git repo
 set(TOP "../../..")
 get_filename_component(TOP "${TOP}" REALPATH)
 
+# Add example src and bsp directories
+set(EXTRA_COMPONENT_DIRS "src" "${TOP}/hw/bsp/esp32s2_saola_1")
+
 include($ENV{IDF_PATH}/tools/cmake/project.cmake)
 set(SUPPORTED_TARGETS esp32s2)