dt-bindings: i2c: ce4100: Replace "ti,pcf8575" by "nxp,pcf8575"

The TI part is equivalent to the NXP part, and its compatible value is
not documented in the DT bindings.

Signed-off-by: Geert Uytterhoeven <[e-mail]>
Reviewed-by: Rob Herring <[e-mail]>
Signed-off-by: Wolfram Sang <[e-mail]>

Documentation/devicetree/bindings/i2c/i2c-pxa-pci-ce4100.txt

···
 			/* This I2C controller has one gpio controller */
 			gpio@26 {
 				#gpio-cells = <2>;
-				compatible = "ti,pcf8575";
+				compatible = "nxp,pcf8575";
 				reg = <0x26>;
 				gpio-controller;
 			};
···
 
 			gpio@26 {
 				#gpio-cells = <2>;
-				compatible = "ti,pcf8575";
+				compatible = "nxp,pcf8575";
 				reg = <0x26>;
 				gpio-controller;
 			};