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refactor: remove BB_MDNS_CACHE_AUTOREGISTER composition knob (B1-1329) (#1173)

Composition knobs die per northstar: composition is hand-wire or
codegen only, never component self-registration. The symbol defaulted
n and nothing in-tree set it, so the guarded self-start path in
bb_mdns_cache_init() was inert on every board -- deleted the Kconfig
stanza (BB_MDNS_CACHE_AUTOREGISTER plus its dependent AUTO_SERVICE/
AUTO_PROTO strings) and the #if/#else self-start branch, leaving
bb_mdns_cache_init() an unconditional no-op stub for the bbtool:init
composition seam.

Downstream verified safe: taipan-brood already calls
bb_mdns_cache_start() explicitly and documents leaving this knob at
default n (the northstar pattern already); all consumers are pinned
to older breadboard commits, so this is invisible until they resync.

bb_mdns_cache_start()/_stop() (the real composition seam) are
retained -- breadboard is a library with a known downstream consumer,
not dead code.

di_legacy fence baseline shrinks 18 -> 16 (autoregister_kconfig +
autoregister_usage entries pruned, shrink-only).

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