[BUG] two errors in setting hkv config in sok

[haiqiang-zhang]

In the file below:

https://github.com/NVIDIA-Merlin/HugeCTR/blob/main/sparse_operation_kit/kit_src/variable/impl/variable_base.cu

line 78 and 88, should be:

device_id = device_id_it->get<int>();
evict_strategy = evict_strategy_it->get<std::string>();

you may made some of typo there