Revert "comment out unused techs for now."
Revert "comment out unused techs for now."

This reverts commit a7c7e46a1ca8f64a7f73ace1d3ef625fb3325278.

viralwang/platform_system_nfcd,mozilla-b2g/platform_system_nfcd,mozilla-b2g/platform_system_nfcd,viralwang/platform_system_nfcd