selftests/xsk: Test AF_XDP functionality under minimal ring configurations

selftests/xsk: Test AF_XDP functionality under minimal ring configurations

Add a new test case that stresses AF_XDP and the driver by configuring
small hardware and software ring sizes. This verifies that AF_XDP continues
to function properly even with insufficient ring space that could lead
to frequent producer/consumer throttling. The test procedure involves:

1. Set the minimum possible ring configuration(tx 64 and rx 128).
2. Run tests with various batch sizes(1 and 63) to validate the system's
   behavior under different configurations.

Update Makefile to include network_helpers.o in the build process for
xskxceiver.

Signed-off-by: Tushar Vyavahare <tushar.vyavahare@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Magnus Karlsson <magnus.karlsson@intel.com>
Link: https://lore.kernel.org/bpf/20240402114529.545475-7-tushar.vyavahare@intel.com