ARM: dts: r8a7791: set maximum frequency for SDHI clocks

Define the upper limit otherwise the driver cannot utilize max speeds.
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a7791.dtsi

@@ -584,6 +584,7 @@
 		dmas = <&dmac0 0xcd>, <&dmac0 0xce>,
 		       <&dmac1 0xcd>, <&dmac1 0xce>;
 		dma-names = "tx", "rx", "tx", "rx";
+		max-frequency = <195000000>;
 		power-domains = <&sysc R8A7791_PD_ALWAYS_ON>;
 		status = "disabled";
 	};
@@ -596,6 +597,7 @@
 		dmas = <&dmac0 0xc1>, <&dmac0 0xc2>,
 		       <&dmac1 0xc1>, <&dmac1 0xc2>;
 		dma-names = "tx", "rx", "tx", "rx";
+		max-frequency = <97500000>;
 		power-domains = <&sysc R8A7791_PD_ALWAYS_ON>;
 		status = "disabled";
 	};
@@ -608,6 +610,7 @@
 		dmas = <&dmac0 0xd3>, <&dmac0 0xd4>,
 		       <&dmac1 0xd3>, <&dmac1 0xd4>;
 		dma-names = "tx", "rx", "tx", "rx";
+		max-frequency = <97500000>;
 		power-domains = <&sysc R8A7791_PD_ALWAYS_ON>;
 		status = "disabled";
 	};