tests/avocado: Boot Linux for RV32 cpu on RV64 QEMU

tests/avocado: Boot Linux for RV32 cpu on RV64 QEMU

make check-avocado AVOCADO_TESTS=tests/avocado/tuxrun_baselines.py: \
TuxRunBaselineTest:test_riscv64_rv32

Signed-off-by: LIU Zhiwei <zhiwei_liu@linux.alibaba.com>
Suggested-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Acked-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Message-ID: <20240919055048.562-9-zhiwei_liu@linux.alibaba.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>