target/loongarch/cpu: Fix cpucfg default value

target/loongarch/cpu: Fix cpucfg default value

We should config cpucfg[20] to set value for the scache's ways, sets,
and size arguments when loongarch cpu init. However, the old code
wirte 'sets argument' twice, so we change one of them to 'size argument'.

Signed-off-by: Xiaojuan Yang <yangxiaojuan@loongson.cn>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220715064829.1521482-1-yangxiaojuan@loongson.cn>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>