ARM: shmobile: porter: enable PCIe

Enable the PCIe controller and clock for the Porter board.

This patch is analogous to the commit 485f3ce6 ("ARM: shmobile:
henninger: Enable PCIe Controller & PCIe bus clock") as there are no
differences between the boards in this respect.
Signed-off-by: NSergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a7791-porter.dts

@@ -244,3 +244,11 @@
 		};
 	};
 };
+
+&pcie_bus_clk {
+	status = "okay";
+};
+
+&pciec {
+	status = "okay";
+};