arm64: dts: ti: k3-am642-sk: Enable WLAN connected to SDHCI0

WL1837 module is connected to SDHCI0 in AM642 SK. Enable it here.
This will enable the WiFi functionaliy on the board.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Signed-off-by: Nikhil Devshatwar <nikhil.nd@ti.com>
Signed-off-by: Aparna M <a-m1@ti.com>
Reviewed-by: Bryan Brattlof <bb@ti.com>
Link: https://lore.kernel.org/r/20220414133612.13365-1-a-m1@ti.com