package/s390-tools: bump to version 2.16.0

- Remove patch 0001-zkey-ekmfweb-fix-linking-of-libekmfweb.patch which has
  been merged.
- Also update the GitHub URL because the project has been renamed.

Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com>
[Peter: also update Config.in URL]
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>