arm: dts: am62a: allow booting from eMMC

The bootph-all property in u-boot enables driver initialization prior to
relocation, this is necessary to use the device as boot media.

sdhci0 is the phandle for eMMC on am62a, so this change allows us to use
eMMC as a boot media.

Signed-off-by: Anshul Dalal <anshuld@ti.com>

arch/arm/dts/k3-am62a7-sk-u-boot.dtsi

@@ -100,6 +100,10 @@
 	bootph-all;
 };
 
+&sdhci0 {
+	bootph-all;
+};
+
 &sdhci1 {
 	bootph-all;
 };