tools: add ULP toolchain for linux-i686 platform

Closes https://github.com/espressif/esp-idf/issues/11561

tools/tools.json

@@ -558,6 +558,11 @@
             "size": 9591791,
             "url": "https://github.com/espressif/binutils-gdb/releases/download/esp32ulp-elf-v2.35_20220830/esp32ulp-elf-2.35_20220830-linux-armhf.tar.gz"
           },
+          "linux-i686": {
+            "sha256": "beb9b6737c975369b6959007739c88f44eb5afbb220f40737071540b2c1a9064",
+            "size": 10596533,
+            "url": "https://github.com/espressif/binutils-gdb/releases/download/esp32ulp-elf-v2.35_20220830/esp32ulp-elf-2.35_20220830-linux-i686.tar.gz"
+          },
           "macos": {
             "sha256": "5a952087b621ced16af1e375feac1371a61cb51ab7e7b44cbefb5afda2d573de",
             "size": 16028909,