redhat/configs: Enable CONFIG_NETKIT for RHEL

JIRA: https://issues.redhat.com/browse/RHEL-51429
Upstream-status: RHEL only, https://gitlab.com/cki-project/kernel-ark

The Netkit virtual device is a light-weight alternative to veth with
native TC-BPF program support. Enabling this is in line with our goal of
making RHEL a first-class platform for using BPF on top of.

Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>

Author: tohojo

redhat/configs/common/generic/CONFIG_NETKIT

@@ -0,0 +1 @@
+CONFIG_NETKIT=y