ARM: at91: dts: sama5d3: move the isi mck pin to mb

The mck is decided by the board design, move it to mb related
dtsi file.

Signed-off-by: Bo Shen <voice.shen@atmel.com>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Josh Wu <josh.wu@atmel.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
diff --git a/arch/arm/boot/dts/sama5d3xmb.dtsi b/arch/arm/boot/dts/sama5d3xmb.dtsi
index 2530541..6af1cba 100644
--- a/arch/arm/boot/dts/sama5d3xmb.dtsi
+++ b/arch/arm/boot/dts/sama5d3xmb.dtsi
@@ -117,6 +117,11 @@
 							<AT91_PIOD 30 AT91_PERIPH_B AT91_PINCTRL_NONE>;	/* PD30 periph B */
 					};
 
+					pinctrl_isi_pck_as_mck: isi_pck_as_mck-0 {
+						atmel,pins =
+							<AT91_PIOD 31 AT91_PERIPH_B AT91_PINCTRL_NONE>;	/* PD31 periph B ISI_MCK */
+					};
+
 					pinctrl_isi_reset: isi_reset-0 {
 						atmel,pins =
 							<AT91_PIOE 24 AT91_PERIPH_GPIO AT91_PINCTRL_NONE>;   /* PE24 gpio */