extcon: fsa9480: Support the FSA880 variant

The older compatible variant of this chip is called FSA880
and works the same way, if we need some quirks in the future,
it is good to let it have its own compatible string.

Cc: [e-mail]
Signed-off-by: Linus Walleij <[e-mail]>
Signed-off-by: Chanwoo Choi <[e-mail]>

Documentation/devicetree/bindings/extcon/extcon-fsa9480.txt

···
 microphone, and UART data to use a common connector port.
 
 Required properties:
- - compatible : Must be "fcs,fsa9480"
+ - compatible : Must be one of
+   "fcs,fsa9480"
+   "fcs,fsa880"
  - reg : Specifies i2c slave address. Must be 0x25.
  - interrupts : Should contain one entry specifying interrupt signal of
    interrupt parent to which interrupt pin of the chip is connected.

drivers/extcon/extcon-fsa9480.c

···
 
 static const struct of_device_id fsa9480_of_match[] = {
 	{ .compatible = "fcs,fsa9480", },
+	{ .compatible = "fcs,fsa880", },
 	{ },
 };
 MODULE_DEVICE_TABLE(of, fsa9480_of_match);