ASoC: Intel: sof_hdmi: add common header for HDMI

Add a common header for Intel HDMI dai link (idisp) initialization.
Declare the sof_hdmi_private structure in machine driver private data
and use it to initialize dai link.
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Brent Lu <brent.lu@intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20231012190826.142619-13-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/boards/sof_hdmi_common.h

+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright(c) 2023 Intel Corporation.
+ */
+
+#ifndef __SOF_HDMI_COMMON_H
+#define __SOF_HDMI_COMMON_H
+
+#include <sound/soc.h>
+
+#define IDISP_CODEC_MASK	0x4
+
+/*
+ * sof_hdmi_private: data for Intel HDMI dai link (idisp) initialization
+ *
+ * @hdmi_comp: ASoC component of idisp codec
+ * @idisp_codec: true to indicate idisp codec is present
+ */
+struct sof_hdmi_private {
+	struct snd_soc_component *hdmi_comp;
+	bool idisp_codec;
+};
+
+#endif /* __SOF_HDMI_COMMON_H */