tools: mark ULP toolchain as not available on 32-bit Linux
tools: mark ULP toolchain as not available on 32-bit Linux

Also install ULP toolchain by default on ARM Linux.

Closes https://github.com/espressif/esp-idf/issues/4621

espressif/esp-idf,espressif/esp-idf,espressif/esp-idf,espressif/esp-idf