sys/linux: describe BPF tail call map

This commit updates the BPF description to be able to prepare a tail
call map referencing one BPF program. Tail call maps are called to jump
from one program (caller) to another (called, referenced in the map).

To that end, we must first create a map of the specific type and then
update it with a BPF program fd. We follow the same approach as
93789af44b9a ("sys/linux: describe map holding constant string") to
specialize the resource outputed by the map update and therefore ensure
we can refer specifically to an updated tail call map.

This new map will be used in a subsequent commit to perform a tail call.

Signed-off-by: Paul Chaignon <paul.chaignon@gmail.com>

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