ARM: tegra: apalis-tk1: Optional DisplayPort hot-plug detect

Configure DP_HPD_PFF0 pin as optional DisplayPort hot-plug detect.
Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm/boot/dts/tegra124-apalis.dtsi

@@ -257,7 +257,7 @@ pex_l1_clkreq_n_pdd6 {
 			};
 			dp_hpd_pff0 {
 				nvidia,pins = "dp_hpd_pff0";
-				nvidia,function = "rsvd2";
+				nvidia,function = "dp";
 				nvidia,pull = <TEGRA_PIN_PULL_NONE>;
 				nvidia,tristate = <TEGRA_PIN_DISABLE>;
 				nvidia,enable-input = <TEGRA_PIN_ENABLE>;