tools: install riscv32-esp-elf for ESP32-S2 as well

riscv32-esp-elf-gcc is used for RISC-V ULP programming.

tools/tools.json

@@ -191,6 +191,8 @@
       "license": "GPL-3.0-with-GCC-exception",
       "name": "riscv32-esp-elf",
       "supported_targets": [
+        "esp32s2",
+        "esp32s3",
         "esp32c3"
       ],
       "version_cmd": [