arm64: dts: rockchip: Add frl-enable-gpios to rk3588s-khadas-edge2

arm64: dts: rockchip: Add frl-enable-gpios to rk3588s-khadas-edge2

The board exposes the GPIO4_B1 pin to control the voltage bias on the
HDMI0 data lines.  It must be asserted when operating in HDMI 2.1 FRL
mode and deasserted for HDMI 1.4/2.0 TMDS mode.

Wire up the hdmi0 node to its dedicated GPIO via frl-enable-gpios to
allow adjusting the bias when transitioning between TMDS and FRL modes.

While at it, remove the duplicated &hdmi0_sound node.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
Link: https://patch.msgid.link/20260428-dts-rk-frl-enable-gpios-v2-7-924df9db884a@collabora.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>