REF:https://github.com/tianocore/edk2/issues/10529
Adds a new PPI that serves the same purpose as EFI_RNG_PROTOCOL in
DXE. This PPI can be produced by a PEIM to provide a dynamic interface
to RNG services in PEI.
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>