drm/bridge: synopsys: Add audio support for dw-hdmi-qp

drm/bridge: synopsys: Add audio support for dw-hdmi-qp

Register the dw-hdmi-qp bridge driver as an HDMI audio codec.

The register values computation functions (for n) are based on the
downstream driver, as well as the register writing functions.

The driver uses the generic HDMI Codec framework in order to implement
the HDMI audio support.

Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Tested-by: Quentin Schulz <quentin.schulz@cherry.de>
Reviewed-by: Robert Foss <rfoss@kernel.org>
Signed-off-by: Detlev Casanova <detlev.casanova@collabora.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20250217215641.372723-2-detlev.casanova@collabora.com