airoha/en7581: use 'airoha,an758x-mmc' instead of mediatek,mt7622-mmc

Mikhail Kshevetskiyrequested to merge
mkshevetskiy-mtk-mmc into devel

This requires fresh u-boot with similar change as we use the same dts for u-boot and linux

see https://dev.iopsys.eu/airoha/u-boot/-/merge_requests/89

Merge request reports