The host endpoint's datapath, living in bpf_host, can be attached to
several devices (host devices and native devices). The BPF program is
compiled once for the first host device (cilium_host) and patched before
loading to adjust it to the other devices, by changing a few symbols in
the object file.

Therefore, the state directory of the host endpoint contains one object
file per device. There is however a single header file, with the values
for the host device.

This commit fixes that to create one header file per device, with the
appropriate values. The goal is to simplify inspection of Cilium state
and avoid having to read symbols manually in the object files.

Signed-off-by: Paul Chaignon <paul@cilium.io>