target/riscv: Add Tenstorrent Ascalon CPU

target/riscv: Add Tenstorrent Ascalon CPU

Add a CPU entry for the Tenstorrent Ascalon CPU, a series of 2 wide to
8 wide RV64 cores. More details can be found at
https://tenstorrent.com/ip/tt-ascalon

Signed-off-by: Anton Blanchard <antonb@tenstorrent.com>
Acked-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Message-ID: <20241113110459.1607299-1-antonb@tenstorrent.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>