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/dts/rv1106-warden.dts

@@ -215,3 +215,33 @@
 &gmac {
 	status = "okay";
 };
+
+/* --- audio: i2s0_8ch (DAI) -> acodec (analog codec) -> speaker/headphone,
+ * tied together by a simple-audio-card. Matches the vendor 86-Panel wiring
+ * in rv1106-luckfox-pico-86panel-ipc.dtsi. The digital speaker modulator
+ * (dsm) driver is ported and builds, but is left disabled here: the panel
+ * uses the acodec path only, and the vendor board itself ships dsm
+ * disabled. --- */
+&acodec {
+	#sound-dai-cells = <0>;
+	status = "okay";
+};
+
+&dsm {
+	status = "disabled";
+};
+
+/ {
+	acodec_sound: acodec-sound {
+		compatible = "simple-audio-card";
+		simple-audio-card,name = "rv1106-acodec";
+		simple-audio-card,format = "i2s";
+		simple-audio-card,mclk-fs = <256>;
+		simple-audio-card,cpu {
+			sound-dai = <&i2s0_8ch>;
+		};
+		simple-audio-card,codec {
+			sound-dai = <&acodec>;
+		};
+	};
+};