ARM: dts: at91: sama5d2: set the sdmmc gclk frequency

Set the frequency of the generated clock used by sdmmc devices in order
to not rely on the configuration done by previous components.
Signed-off-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Link: https://lore.kernel.org/r/20191128074522.69706-3-ludovic.desroches@microchip.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

arch/arm/boot/dts/sama5d2.dtsi

@@ -300,6 +300,8 @@ sdmmc0: sdio-host@a0000000 {
 			interrupts = <31 IRQ_TYPE_LEVEL_HIGH 0>;
 			clocks = <&pmc PMC_TYPE_PERIPHERAL 31>, <&pmc PMC_TYPE_GCK 31>, <&pmc PMC_TYPE_CORE PMC_MAIN>;
 			clock-names = "hclock", "multclk", "baseclk";
+			assigned-clocks = <&pmc PMC_TYPE_GCK 31>;
+			assigned-clock-rates = <480000000>;
 			status = "disabled";
 		};
 
@@ -309,6 +311,8 @@ sdmmc1: sdio-host@b0000000 {
 			interrupts = <32 IRQ_TYPE_LEVEL_HIGH 0>;
 			clocks = <&pmc PMC_TYPE_PERIPHERAL 32>, <&pmc PMC_TYPE_GCK 32>, <&pmc PMC_TYPE_CORE PMC_MAIN>;
 			clock-names = "hclock", "multclk", "baseclk";
+			assigned-clocks = <&pmc PMC_TYPE_GCK 32>;
+			assigned-clock-rates = <480000000>;
 			status = "disabled";
 		};