arm: dts: beacon-rzg2: Resync device trees with Linux 5.16-rc3

The device trees for the Beacon RZ/G2[MNH] boards have undergone
some changes over time, so resync them now.

Signed-off-by: Adam Ford <aford173@gmail.com>
diff --git a/arch/arm/dts/r8a774e1-beacon-rzg2h-kit.dts b/arch/arm/dts/r8a774e1-beacon-rzg2h-kit.dts
index 273f062..7b6649a 100644
--- a/arch/arm/dts/r8a774e1-beacon-rzg2h-kit.dts
+++ b/arch/arm/dts/r8a774e1-beacon-rzg2h-kit.dts
@@ -22,6 +22,9 @@
 		serial5 = &scif5;
 		serial6 = &scif4;
 		ethernet0 = &avb;
+		mmc0 = &sdhi3;
+		mmc1 = &sdhi0;
+		mmc2 = &sdhi2;
 	};
 
 	chosen {