unix: fix uv_cpu_info() error on FreeBSD
unix: fix uv_cpu_info() error on FreeBSD

This commit updates the key used in uv_cpu_info()
for ARM FreeBSD.

Fixes: https://github.com/nodejs/node/issues/17995
Fixes: https://github.com/libuv/libuv/issues/1694
PR-URL: https://github.com/libuv/libuv/pull/1700
Reviewed-By: Colin Ihrig <838f779c91673db29b8572ea3f54d191d3878ae2@gmail.com>
Reviewed-By: Ben Noordhuis <59bd0a3ff43b32849b319e645d4798d8a5d1e889@bnoordhuis.nl>
Reviewed-By: Santiago Gimeno <3f17e29e343c4cf8809fb0970d81d6d8ee88d6b3@gmail.com>

unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso