udp: Remove duplicate included header file trace/events/udp.h

Remove duplicate included header file trace/events/udp.h and the
following warning reported by make includecheck:

  trace/events/udp.h is included more than once

Compile-tested only.

Signed-off-by: Thorsten Blum <thorsten.blum@toblux.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20240706071132.274352-2-thorsten.blum@toblux.com


Signed-off-by: Paolo Abeni <pabeni@redhat.com>