kernel/rv1106: audio codec VERIFIED — sound card + PCM registers

Ported rv1106_codec.c (acodec) + rk_dsm.c (built, dsm disabled — panel uses
acodec) into 6.18 (6 ASoC API-delta fixes: gpiod, volsw unify, DAIFMT CBC/CBP
rename, remove->void, header swaps). simple-audio-card 'rv1106-acodec'.

Fixed the subagent's gap: cpu DAI SND_SOC_ROCKCHIP_I2S_TDM was left =m (module,
never loaded on bare _b boot) so the card stuck in 'asoc-simple-card: parse
error' deferred probe. Set it + SND_SOC_ROCKCHIP =y.

✅ VERIFIED on c8a3: /proc/asound/cards shows rv1106-acodec; aplay -l shows
card 0 device 0 ffae0000.i2s-rv1106-hifi; /dev/snd has pcmC0D0p + pcmC0D0c.
Audible speaker test deferred to the bench (with display).

Six drivers verified this run: wifi, TRNG, OTP, GMAC, SARADC, audio.
audio/PORT-PROGRESS.md; DRIVER-PARITY updated; dts snapshot refreshed.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017wB8KB3MMQztRDXCMCkPrf

kernel/rv1106-enablement/DRIVER-PARITY.md

@@ -40,7 +40,8 @@ c8a3, not just compiled.
 | AIC8800 BT (btlpm) | aic8800_btlpm | **out-of-tree** | 🔨 module built (6.18 vermagic); HCI bring-up not yet exercised |
 | NPU (rknpu, ff660000) | rknpu, ff660000.npu | **out-of-tree** | ⬜ M6 — plan: `npu/PORT-PLAN.md` |
 | RGA 2D (rga2) | rga2 | ported (vendor char-dev) | ✅ /dev/rga, hw 3.3.87975 |
-| I2S audio (i2s-tdm) | i2s | rv1126 fallback | 🔨 DAI built; needs acodec+card |
+| I2S audio (i2s-tdm) | i2s | rv1126 fallback (=y) | ✅ cpu DAI registers (part of the card below) |
+| Audio codec (acodec) | rockchip,rv1106-codec | ported (rv1106_codec.c) | ✅ card `rv1106-acodec`, pcmC0D0p/c (`audio/`); audible test @ bench |
 | FIQ debugger (ttyFIQ0) | fiq_glue | rockchip | ⬜ optional (we use ttyS2) |
 
 Legend: ✅ verified on hardware · 🔨 built, not yet verified · ⬜ not started.