ARM: dts: at91-sama5d27_som1_ek: add drive strength for LCD base signals

Set drive strength to medium for LCD base signals to avoid the
"tearing effect".

Signed-off-by: Ludovic Desroches <ludovic.desroches@microchip.com>

Author: ldesroches

arch/arm/boot/dts/at91-sama5d27_som1_ek_common.dtsi

@@ -47,6 +47,7 @@
 #include "at91-sama5d27_som1.dtsi"
 #include <dt-bindings/mfd/atmel-flexcom.h>
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/pinctrl/at91.h>
 
 / {
 	model = "Atmel SAMA5D27 SOM1 EK";
@@ -323,6 +324,7 @@
 						 <PIN_PC8__LCDDEN>,
 						 <PIN_PC7__LCDPCK>;
 					bias-disable;
+					drive-strength = <ATMEL_PIO_DRVSTR_ME>;
 				};
 
 				pinctrl_lcd_rgb: pinctrl_lcd_rgb {