Feed CPUID data into RNG
Summary:
Partial backport of core PR17270:
https://github.com/bitcoin/bitcoin/pull/17270/commits/11793ea22e1298fa7d3b44a5b6d20830248d8cf4
Test Plan:
ninja all check-all
Reviewers: #bitcoin_abc, deadalnix
Reviewed By: #bitcoin_abc, deadalnix
Differential Revision: https://reviews.bitcoinabc.org/D6205