target/riscv/tcg: move riscv_cpu_add_misa_properties() to tcg-cpu.c

target/riscv/tcg: move riscv_cpu_add_misa_properties() to tcg-cpu.c

All code related to MISA TCG properties is also moved.

At this point, all TCG properties handling is done in tcg-cpu.c, all KVM
properties handling is done in kvm-cpu.c.

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: <20230925175709.35696-18-dbarboza@ventanamicro.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>