freertos: Move FreeRTOSConfig_arch.h

This commit moves the FreeRTOSConfig_arc.h to the "esp_additions" directory
so that they can also be used for SMP FreeRTOS builds.

components/freertos/CMakeLists.txt

@@ -33,10 +33,11 @@ set(srcs
 
 set(include_dirs
     "${kernel_dir}/include" # FreeRTOS headers via #include "freertos/xxx.h"
-    "${kernel_dir}/portable/${arch}/include" # For arch-specific FreeRTOSConfig_arch.h in portable/<arch>/include
+    "${kernel_dir}/portable/${arch}/include" # For arch-specific #include "freertos/portmacro.h"
     "esp_additions/include/freertos"         # For files with #include "FreeRTOSConfig.h"
-    "esp_additions/include")                 # For files with #include "freertos/FreeRTOSConfig.h"
+    "esp_additions/include"                  # For files with #include "freertos/FreeRTOSConfig.h"
                                              #      or #include "freertos/task_snapshot.h"
+    "esp_additions/arch/${arch}/include")    # For #include "freertos/FreeRTOSConfig_arch.h"
 
 set(private_include_dirs
     "${kernel_dir}/portable/${arch}/include/freertos"