ARM64: dts: meson-gxm: enable HS400 on the vim2

Enable HS400 high speed eMMC mode on the khadas vim2
Signed-off-by: NJerome Brunet <jbrunet@baylibre.com>
Signed-off-by: NKevin Hilman <khilman@baylibre.com>

arch/arm64/boot/dts/amlogic/meson-gxm-khadas-vim2.dts

@@ -348,6 +348,7 @@
 	disable-wp;
 	mmc-ddr-1_8v;
 	mmc-hs200-1_8v;
+	mmc-hs400-1_8v;
 
 	mmc-pwrseq = <&emmc_pwrseq>;
 	vmmc-supply = <&vcc_3v3>;