cpu: Define ArchCPU

For all targets, do this just before including exec/cpu-all.h.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Acked-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

target/riscv/cpu.h

@@ -335,6 +335,7 @@ void riscv_set_csr_ops(int csrno, riscv_csr_operations *ops);
 void riscv_cpu_register_gdb_regs_for_features(CPUState *cs);
 
 typedef CPURISCVState CPUArchState;
+typedef RISCVCPU ArchCPU;
 
 #include "exec/cpu-all.h"