arm64: dts: mt8192: Add mmc device nodes

In mt8192 SoC, mmc driver dose not use the MSDC module to control
clock. It will read/write register to enable/disable clock. Also
there is no other device of mt8192 using MSDC controller.

We add mmc nodes for mt8192 SoC and remove the clock-controller in
dts for avoid a duplicate unit-address(11f60000) warning.

Signed-off-by: Allen-KH Cheng <allen-kh.cheng@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Link: https://lore.kernel.org/r/20220407113703.26423-2-allen-kh.cheng@mediatek.com
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>