gpio: clps711x: Change the compatibility string

This patch changes the compatibility string to match with the smallest
supported chip (EP7209). Since the DT-support for this CPU is not yet
announced, this change is safe.

Signed-off-by: Alexander Shiyan <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

Documentation/devicetree/bindings/gpio/gpio-clps711x.txt

···
 Cirrus Logic CLPS711X GPIO controller
 
 Required properties:
-- compatible: Should be "cirrus,clps711x-gpio"
+- compatible: Should be "cirrus,ep7209-gpio"
 - reg: Physical base GPIO controller registers location and length.
   There should be two registers, first is DATA register, the second
   is DIRECTION.
···
 };
 
 porta: gpio@80000000 {
-	compatible = "cirrus,clps711x-gpio";
+	compatible = "cirrus,ep7312-gpio","cirrus,ep7209-gpio";
 	reg = <0x80000000 0x1>, <0x80000040 0x1>;
 	gpio-controller;
 	#gpio-cells = <2>;

drivers/gpio/gpio-clps711x.c

···
 }
 
 static const struct of_device_id __maybe_unused clps711x_gpio_ids[] = {
-	{ .compatible = "cirrus,clps711x-gpio" },
+	{ .compatible = "cirrus,ep7209-gpio" },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, clps711x_gpio_ids);