change(xtensa): Deprecate ".../xtensa_api.h" include path

This commit deprecates the "freertos/xtensa_api.h" and "xtensa/xtensa_api.h"
include paths. Users should use "xtensa_api.h" instead.

- Replace legacy include paths
- Removed some unnecessary includes of "xtensa_api.h"
- Replaced some calls with "esp_cpu_..." equivalents
- Add warning to compatibility header

components/bt/controller/esp32c3/bt.c

@@ -43,8 +43,6 @@
 #include "riscv/interrupt.h"
 #include "esp32c3/rom/rom_layout.h"
 #else //CONFIG_IDF_TARGET_ESP32S3
-#include "freertos/xtensa_api.h"
-#include "xtensa/core-macros.h"
 #include "esp32s3/rom/rom_layout.h"
 #endif
 #if CONFIG_BT_ENABLED