Crash using riscv.shakti.cclass.soc device

As of commit 11a11998 ("Merge remote-tracking branch 'remotes/rth/tags/pull-tcg-20210921' into staging"):

$ qemu-system-riscv64 -device riscv.shakti.cclass.soc
**
ERROR:tcg/tcg.c:479:tcg_register_thread: assertion failed: (n < tcg_max_ctxs)
Bail out! ERROR:tcg/tcg.c:479:tcg_register_thread: assertion failed: (n < tcg_max_ctxs)

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