arm64: dts: ti: k3-j784s4-evm: Add eMMC mmc0 support

Add support for eMMC connected to main sdhci0 instance.

Signed-off-by: Apurva Nandan <a-nandan@ti.com>
Reviewed-by: Bhavya Kapoor <b-kapoor@ti.com>
Link: https://lore.kernel.org/r/20230327083100.12587-1-a-nandan@ti.com


Signed-off-by: Nishanth Menon <nm@ti.com>