ARM: dts: orion5x: fix number of sata port for linkstation ls-gl

Bug report from Debian [0] shows there's minor changed model of
Linkstation LS-GL that uses the 2nd SATA port of the SoC.
So it's necessary to enable two SATA ports, though for that specific
model only the 2nd one is used.

[0] https://bugs.debian.org/845611

Fixes: b1742ffa ("ARM: dts: orion5x: add device tree for buffalo linkstation ls-gl")
Reported-by: Ryan Tandy <ryan@nardis.ca>
Tested-by: Ryan Tandy <ryan@nardis.ca>
Signed-off-by: Roger Shimizu <rogershimizu@gmail.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>

arch/arm/boot/dts/orion5x-linkstation-lsgl.dts

@@ -82,6 +82,10 @@ &usb_power {
 	gpios = <&gpio0 9 GPIO_ACTIVE_HIGH>;
 };
 
+&sata {
+	nr-ports = <2>;
+};
+
 &ehci1 {
 	status = "okay";
 };