ARM: dts: samsung: exynos5800-peach-pi: switch to undeprecated DP HPD GPIOs

ARM: dts: samsung: exynos5800-peach-pi: switch to undeprecated DP HPD GPIOs

'samsung,hpd-gpio' property is deprecated and uses also deprecated
'gpio' suffix which is not matched by dtbs_check:

  exynos5800-peach-pi.dtb: dp-controller@145b0000: 'samsung,hpd-gpio' does not match any of the regexes: 'pinctrl-[0-9]+'

Switch to hpd-gpios property.

Link: https://lore.kernel.org/r/20240313183011.14253-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>