ARM: dts: am57xx-evm: Add 'gpios' property with gpio2_8

gpio2_8 is connected to the PCIe_RESETn line and it has to be driven low to
reset the PCIe cards.  Add gpios property to PCIe DT node.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/boot/dts/am57xx-beagle-x15.dts b/arch/arm/boot/dts/am57xx-beagle-x15.dts
index a63bf78..f9a4b31 100644
--- a/arch/arm/boot/dts/am57xx-beagle-x15.dts
+++ b/arch/arm/boot/dts/am57xx-beagle-x15.dts
@@ -693,3 +693,7 @@
 		};
 	};
 };
+
+&pcie1 {
+	gpios = <&gpio2 8 GPIO_ACTIVE_LOW>;
+};