soc: esp32s3: enable zephyr toolchain

SDK 0.16 includes ESP32-S3 toolchain. This PR enable
its usage.

Signed-off-by: Sylvio Alves <[email protected]>

Author: sylvioalves

boards/xtensa/esp32s3_devkitm/esp32s3_devkitm.yaml

@@ -3,7 +3,7 @@ name: ESP32-S3 DevKitM
 type: mcu
 arch: xtensa
 toolchain:
-  - espressif
+  - zephyr
 supported:
   - gpio
   - uart