arm64: dts: rockchip: Add frl-enable-gpios to rk3588 boards

arm64: dts: rockchip: Add frl-enable-gpios to rk3588 boards

The following RK3588 boards expose one or two GPIO pins to control the
voltage bias on the HDMI0 and/or HDMI1 data lines:

- rk3588-armsom-sige7
- rk3588-armsom-w3
- rk3588-coolpi-cm5-evb
- rk3588-coolpi-cm5-genbook
- rk3588-evb1-v10
- rk3588-evb2-v10
- rk3588-firefly-itx-3588j
- rk3588-friendlyelec-cm3588-nas
- rk3588-h96-max-v58
- rk3588-jaguar
- rk3588-mnt-reform2
- rk3588-nanopc-t6
- rk3588-orangepi-5-max
- rk3588-orangepi-5-plus
- rk3588-orangepi-5-ultra
- rk3588-roc-rt
- rk3588-rock-5-itx
- rk3588-rock-5b-5bp-5t
- rk3588-tiger

The pins 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 and/or hdmi1 nodes to their dedicated GPIO pin(s) via
frl-enable-gpios to allow adjusting the bias when transitioning between
TMDS and FRL modes.

While at it, also ensure that pinctrl-names is present and ordered
alphabetically within the hdmi nodes.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
Link: https://patch.msgid.link/20260428-dts-rk-frl-enable-gpios-v2-4-924df9db884a@collabora.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>