internal: re-enable dlp generation
internal: re-enable dlp generation

I looked over the changes and this ended up not being a breaking
change for Go. Fields were properly deprecated and not removed.
This was only a breaking change for languages that have overloaded
method signatures.

Fixes: #1969

Change-Id: Ib3ff69281e2e2cae9aa771cba0e55fb18008123b
Reviewed-on: https://code-review.googlesource.com/c/gocloud/+/56972
Reviewed-by: Tyler Bui-Palsulich <b41e4aa57d2ad7eb1b29835a1b483e209dcc3c0e@google.com>

googleapis/google-cloud-go,googleapis/google-cloud-go,googleapis/google-cloud-go,googleapis/google-cloud-go