arm64: dts: ti: k3-am625-sk: Enable on board peripherals

Add nodes for I2C IO expander, OSPI Flash, Eth PHYs, SD and eMMC that
are present on AM625 SK board.

Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Reviewed-by: Bryan Brattlof <bb@ti.com>
Link: https://lore.kernel.org/r/20220427072954.8821-3-vigneshr@ti.com