ARM: shmobile: porter: enable PCIe

Enable the PCIe controller and clock for the Porter board.

This patch is analogous to the commit 485f3ce67c11 ("ARM: shmobile:
henninger: Enable PCIe Controller & PCIe bus clock") as there are no differences between the boards in this respect.

---
This patch is against 'renesas-devel-20151008-v4.3-rc4' tag of Simon Horman's 'renesas.git' repo plus the Porter I2C2, VIN0/ADV7180, and QSPI patches posted earlier.

 arch/arm/boot/dts/r8a7791-porter.dts |    8 ++++++++
 1 file changed, 8 insertions(+)

Index: renesas/arch/arm/boot/dts/r8a7791-porter.dts
===================================================================
@@ -244,3 +244,11 @@
 		};
 	};
 };
+
+&pcie_bus_clk {
+	status = "okay";
+};
+
+&pciec {
+	status = "okay";
+};

Thanks, I have queued this up for v4.4.