Adds get_advanced_eq_defaults (function 5), get_advanced_eq_friendly_name
(function 6), and a probe_all_presets helper that reads every factory
and custom preset slot and logs its name + band data at INFO.
The G522 exposes 6 factory presets and 10 custom slots. Reading each
and dumping (freq_u16, gain_db, q_u16) across a corpus of named presets
(Flat, Bass Boost, Vocal, etc.) should reveal the u16->Hz and u16->Q
encodings by pattern-matching — without needing a LGHUB pcap. The
results land in the normal -dd log so the next tester run gives us the
data.
One-shot probe runs at HeadsetAdvancedEQ.build() for V2 devices only.
Failures are logged at INFO and don't block panel construction.
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