drm/verisilicon: hdmi: Add support audio hdmi driver

drm/verisilicon: hdmi: Add support audio hdmi driver

Add support hdmi audio driver of starfive JH7110. This driver is from
[1], and the imported patch list[2]. We modified to use struct
starfive_hmdi instead of struct inno_hdmi also added to use
legacy_dai_naming.

[1] https://github.com/starfive-tech/linux

[2] patch list from v5.15.y
  5bec3220a8be drm:verisilicon:hdmi-audio:Adjust when to configure registers
  5a302a7a25fe gpu:drm:Add audio function in inno hdmi

Signed-off-by: Xingyu Wu <xingyu.wu@starfivetech.com>
Change-Id: Iae0ec57f2cf588c7ca177f7e284968ca9e68c674
Signed-off-by: Hoegeun Kwon <hoegeun.kwon@samsung.com>