target/riscv: Handle Smrnmi interrupt and exception

Because the RNMI interrupt trap handler address is implementation defined.
We add the 'rnmi-interrupt-vector' and 'rnmi-exception-vector' as the property
of the harts. It’s very easy for users to set the address based on their
expectation. This patch also adds the functionality to handle the RNMI signals.

Signed-off-by: Frank Chang <frank.chang@sifive.com>
Signed-off-by: Tommy Wu <tommy.wu@sifive.com>
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-ID: <20250106054336.1878291-4-frank.chang@sifive.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

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