drm/bridge: ite-it66121: Convert to DRM HDMI Audio Helper

Convert the IT66121 HDMI bridge driver from manually registering an
hdmi-codec platform device to using the DRM HDMI Audio Helper framework
via DRM_BRIDGE_OP_HDMI_AUDIO instead.

The previous implementation manually allocated hdmi_codec_pdata,
registered the platform device, and implemented hdmi_codec_ops callbacks
including get_eld. The new approach sets DRM_BRIDGE_OP_HDMI_AUDIO on the
bridge, letting the framework handle the codec registration. This also
resolves some non-compliance issues with the current audio implementation,
such as HDMI audio advertising a non-functional capture stream to userspace.

The audio callbacks are converted from hdmi_codec_ops signatures to
drm_bridge_funcs hdmi_audio callbacks:
  - it66121_audio_hw_params   -> it66121_hdmi_audio_prepare
  - it66121_audio_startup     -> it66121_hdmi_audio_startup
  - it66121_audio_shutdown    -> it66121_hdmi_audio_shutdown
  - it66121_audio_mute        -> it66121_hdmi_audio_mute_stream

The it66121_audio_get_eld, it66121_audio_codec_ops, and
it66121_audio_codec_init functions are removed as the framework handles
these responsibilities.

Suggested-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Signed-off-by: Sen Wang <sen@ti.com>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Link: https://patch.msgid.link/20260318154636.3230454-1-sen@ti.com
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>

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