selftests: tc-testing: add missing Kconfig options to 'config'

Make sure CI builds using just tc-testing/config can run all tdc tests.
Some tests were broken because of missing knobs.
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Pedro Tammela <pctammela@mojatatu.com>
Link: https://lore.kernel.org/r/20231017152309.3196320-2-pctammela@mojatatu.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

tools/testing/selftests/tc-testing/config

+#
+# Network
+#
+
+CONFIG_DUMMY=y
+CONFIG_VETH=y
+
 #
 # Core Netfilter Configuration
 #
+CONFIG_NETFILTER_ADVANCED=y
 CONFIG_NF_CONNTRACK=m
 CONFIG_NF_CONNTRACK_MARK=y
 CONFIG_NF_CONNTRACK_ZONES=y
 CONFIG_NF_CONNTRACK_LABELS=y
 CONFIG_NF_CONNTRACK_PROCFS=y
 CONFIG_NF_FLOW_TABLE=m
+CONFIG_NF_TABLES=m
 CONFIG_NF_NAT=m
 CONFIG_NETFILTER_XT_TARGET_LOG=m