arm64: dts: ti: k3-am64-tqma64xxl-mbax4xxl: add SD-card and WLAN overlays

As the SD-card and WLAN are connected to the same SDHC interface (with a
GPIO-controlled mux), they are mutually exclusive. Provide Device Tree
overlays for both configurations.

Signed-off-by: Matthias Schiffer <matthias.schiffer@ew.tq-group.com>
Link: https://lore.kernel.org/r/8ff8a6f1fdbe6ebb478f88bb0737628054c43c5b.1690463382.git.matthias.schiffer@ew.tq-group.com
Signed-off-by: Nishanth Menon <nm@ti.com>