ARM: dts: am43xx-epos-evm: Add phandle for the backlight for the panel

With the backlight phandle the driver can manage the backlight on/off in
sync with the panel enable/disable.
Signed-off-by: NPeter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am43x-epos-evm.dts

@@ -48,6 +48,8 @@
 		compatible = "osddisplays,osd057T0559-34ts", "panel-dpi";
 		label = "lcd";
 
+		backlight = <&lcd_bl>;
+
 		panel-timing {
 			clock-frequency = <33000000>;
 			hactive = <800>;
@@ -107,7 +109,7 @@
 			0x03030069>;	/* LEFT */
 	};
 
-	backlight {
+	lcd_bl: backlight {
 		compatible = "pwm-backlight";
 		pwms = <&ecap0 0 50000 PWM_POLARITY_INVERTED>;
 		brightness-levels = <0 51 53 56 62 75 101 152 255>;