drm/rockchip: inno_hdmi: Switch to HDMI connector

The new HDMI connector infrastructure allows to remove some boilerplate,
especially to generate infoframes. Let's switch to it.

Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Andy Yan <andyshrk@163.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240527-kms-hdmi-connector-state-v15-28-c5af16c3aae2@kernel.org


Signed-off-by: Maxime Ripard <mripard@kernel.org>