selftests/net/forwarding: add missing tests to Makefile
Hangbin Liu authored

When generating the selftests to another folder, the fixed tests are
missing as they are not in Makefile, e.g.

  make -C tools/testing/selftests/ install \
  	TARGETS="net/forwarding" INSTALL_PATH=/tmp/kselftests
Signed-off-by: default avatarHangbin Liu <liuhangbin@gmail.com>
Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
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