target/riscv/tcg: introduce tcg_cpu_instance_init()

tcg_cpu_instance_init() will be the 'cpu_instance_init' impl for the TCG
accelerator. It'll be called from within riscv_cpu_post_init(), via
accel_cpu_instance_init(), similar to what happens with KVM. In fact, to
preserve behavior, the implementation will be similar to what
riscv_cpu_post_init() already does.

In this patch we'll move riscv_cpu_add_user_properties() and
riscv_init_max_cpu_extensions() and all their dependencies to tcg-cpu.c.
All multi-extension properties code was moved. The 'multi_ext_user_opts'
hash table was also moved to tcg-cpu.c since it's a TCG only structure,
meaning that we won't have to worry about initializing a TCG hash table
when running a KVM CPU anymore.

riscv_cpu_add_user_properties() will remain in cpu.c for now due to how
much code it requires to be moved at the same time. We'll do that in the
next patch.

Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-ID: <20230925175709.35696-16-dbarboza@ventanamicro.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

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