Add a Fallback RNG (RH only)

Oliver Steffenrequested to merge
osteffen/edk2:RHEL-66234-fallback-rng-c10s into c10s

Merge Request Required Information

JIRA: https://issues.redhat.com/browse/RHEL-66234

Summary of Changes

Adds a fallback RNG - as introduced earlier for x86_64, also to the Aarch64 build. It will provide pseudo random numbers in case no hardware RNG is available to ensure network booting still works.

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