The EFI_RNG_PROTOCOL published by RngDxe has been updated to
implement the EFI_RNG_ALGORITHM_RAW using the Arm TRNG interface
to provide access to entropy.
Therefore, enable EFI_RNG_PROTOCOL for the Kvmtool guest/virtual
firmware.
Signed-off-by: Pierre Gondois <pierre.gondois@arm.com> Reviewed-by: Ard Biesheuvel <ardb@kernel.org>