arm: dts: mediatek: Get rid of mediatek, larb for MM nodes

arm: dts: mediatek: Get rid of mediatek, larb for MM nodes

After adding device_link between the IOMMU consumer and smi, the
mediatek,larb is unnecessary now.

CC: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: Yong Wu <yong.wu@mediatek.com>
Signed-off-by: Allen-KH Cheng <allen-kh.cheng@mediatek.com>
Reviewed-by: Evan Green <evgreen@chromium.org>
Tested-by: Frank Wunderlich <frank-w@public-files.de> # BPI-R2/MT7623
Link: https://lore.kernel.org/r/20220421035111.7267-2-allen-kh.cheng@mediatek.com
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>