Revert "tftp-hpa: try to fix build."

This reverts commit 30a7a2e6a30860c33fc32a3b007b27b58c7d0a34.
Revert "tftp-hpa: disable_parallel_build=yes."

This reverts commit 6ef9413c885b9a9f9f7f4ea9da3df5f69058d542.