dt-bindings: add "microchip,24c128" compatible string

This adds "microchip,24c128" to the list of compatible strings for i2c
eeproms.

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: David Lechner <david@lechnology.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>

Documentation/devicetree/bindings/eeprom/eeprom.txt

@@ -10,6 +10,8 @@ Required properties:
 
 	"catalyst,24c32"
 
+	"microchip,24c128"
+
 	"ramtron,24c64"
 
 	"renesas,r1ex24002"