tlc59108bl bindings

Required properties:
  - compatible: "ti,tlc59108-bl"
  - reg: I2C slave address (u8)
  - enable-gpios: gpio signal to power on the tlc59108 backlight controller


Example:

        /* TLC chip for LCD panel power and backlight  */
       tlc59108bl: tlc59108bl@40 {
                compatible = "ti,tlc59108-bl";
                reg = <0x40>;
                enable-gpios = <&pcf_lcd 13 GPIO_ACTIVE_LOW>;  /* P15, CON_LCD_PWR_DN */
        };
