arm64: dts: rockchip: fix second M.2 slot on ROCK 5T

The Radxa ROCK 5T has two M.2 slots, much like the Radxa Rock 5B+. As it
stands, the board won't be able to use PCIe3 if the second M.2 slot is
in use.

Fix this by adding the necessary node enablement and data-lanes property
to the ROCK 5T device tree, mirroring what's in the ROCK 5B+ device
tree.

Reported-by: FUKAUMI Naoki <[email protected]>
Closes: https://libera.catirclogs.org/linux-rockchip/2025-08-25#38610630;
Fixes: 0ea651d ("arm64: dts: rockchip: add ROCK 5T device tree")
Signed-off-by: Nicolas Frattaroli <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Heiko Stuebner <[email protected]>

Author: Nicolas Frattaroli

arch/arm64/boot/dts/rockchip/rk3588-rock-5t.dts

@@ -68,6 +68,22 @@
 	status = "okay";
 };
 
+&pcie30phy {
+	data-lanes = <1 1 2 2>;
+};
+
+&pcie3x2 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pcie3x2_rst>;
+	reset-gpios = <&gpio4 RK_PB0 GPIO_ACTIVE_HIGH>;
+	vpcie3v3-supply = <&vcc3v3_pcie30>;
+	status = "okay";
+};
+
+&pcie3x4 {
+	num-lanes = <2>;
+};
+
 &pinctrl {
 	hdmirx {
 		hdmirx_hpd: hdmirx-5v-detection {
@@ -90,6 +106,12 @@
 		};
 	};
 
+	pcie3 {
+		pcie3x2_rst: pcie3x2-rst {
+			rockchip,pins = <4 RK_PB0 RK_FUNC_GPIO &pcfg_pull_none>;
+		};
+	};
+
 	sound {
 		hp_detect: hp-detect {
 			rockchip,pins = <4 RK_PC3 RK_FUNC_GPIO &pcfg_pull_none>;