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Supervisor software can enable control flow integrity features for itself using fwft feature `SBI_FWFT_LANDING_PAD` and `SBI_FWFT_SHADOW_STACK`. This patch implements the mechanism to enable both these fwft. Signed-off-by: Deepak Gupta <debug@rivosinc.com> Reviewed-by: Atish Patra <atishp@rivosinc.com> Reviewed-by: Clément Léger <cleger@rivosinc.com>