package/rdma-core: bump to version v51.0

For change log since v49.0, see:
https://github.com/linux-rdma/rdma-core/releases/tag/v50.0
https://github.com/linux-rdma/rdma-core/releases/tag/v51.0

This commit drops the package patch, which is included v50.0.

Signed-off-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>
3 files changed