gpio: sprd: Use SoC compatible string instead of wildcard string

Use SoC compatible string instead of wildcard string.

Reviewed-by: Rob Herring <[e-mail]>
Signed-off-by: Baolin Wang <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

Documentation/devicetree/bindings/gpio/gpio-eic-sprd.txt

···
   "sprd,sc9860-eic-latch",
   "sprd,sc9860-eic-async",
   "sprd,sc9860-eic-sync",
-  "sprd,sc27xx-eic".
+  "sprd,sc2731-eic".
 - reg: Define the base and range of the I/O address space containing
   the GPIO controller registers.
 - gpio-controller: Marks the device node as a GPIO controller.
···
 	};
 
 	pmic_eic: gpio@300 {
-		compatible = "sprd,sc27xx-eic";
+		compatible = "sprd,sc2731-eic";
 		reg = <0x300>;
 		interrupt-parent = <&sc2731_pmic>;
 		interrupts = <5 IRQ_TYPE_LEVEL_HIGH>;