drm/nouveau/i2c: segregate aux channel adapter indices from bit-banged i2c

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nouveau_bios.c b/drivers/gpu/drm/nouveau/nouveau_bios.c
index dae2c96..2c6b4a0 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bios.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bios.c
@@ -1493,6 +1493,7 @@
 			break;
 		}
 		link = entry->dpconf.sor.link;
+		entry->i2c_index += NV_I2C_AUX(0);
 		break;
 	case DCB_OUTPUT_TMDS:
 		if (dcb->version >= 0x40) {