arm64: dts: mediatek: Replace 'enable-sdio-wakeup'

As explained in Documentation/devicetree/bindings/mmc/mmc-controller.yaml,
the 'enable-sdio-wakeup' property is considered deprecated.

Replace it with the 'wakeup-source' property instead.

Signed-off-by: Fabio Estevam <festevam@denx.de>
Link: https://lore.kernel.org/r/20220621124435.121740-1-festevam@gmail.com


Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>