[PATCH] Fix scdc implementation missing in GK208B NVidia Card (gk104_sor_hdmi)

[Giuseppe Ranieri <giuseppe@ranieri.dev>]

I fixed a problem for the GK208B NVidia Card (GT710): 
the initialization was broken my card support scdc channel but the implementation was missing.

The problem was tracked by Mathias Anselmann in
https://bugzilla.kernel.org/show_bug.cgi?id=219561 and https://gitlab.freedesktop.org/drm/nouveau/-/issues/402

This patch fix the card initialization and fix audio problem on my card GK208B  
the code path is shared by 
nouveau/nvkm/engine/device/base.c- .name = "GK110",
nouveau/nvkm/engine/device/base.c- .name = "GK110B",
nouveau/nvkm/engine/device/base.c- .name = "GK208B",
nouveau/nvkm/engine/device/base.c- .name = "GK208",

I have done another patch so the code don´t broke anymore the initialization if the scdc implementation is missing when supported by the card. It will raise a DBG message instead.


Signed-off-by: Giuseppe Ranieri <giuseppe@ranieri.dev>
---

diff '--color=auto' -ur a/drivers/gpu/drm/nouveau/nvkm/engine/disp/gk104.c b/drivers/gpu/drm/nouveau/nvkm/engine/disp/gk104.c
--- a/drivers/gpu/drm/nouveau/nvkm/engine/disp/gk104.c	2025-11-30 23:42:10.000000000 +0100
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/gk104.c	2026-01-16 19:03:51.175827296 +0100
@@ -106,6 +106,7 @@
 const struct nvkm_ior_func_hdmi
 gk104_sor_hdmi = {
 	.ctrl = gk104_sor_hdmi_ctrl,
+	.scdc = gm200_sor_hdmi_scdc,
 	.infoframe_avi = gk104_sor_hdmi_infoframe_avi,
 	.infoframe_vsi = gk104_sor_hdmi_infoframe_vsi,
 };