dt-bindings: PCI: mediatek-gen3: Support mt8195

dt-bindings: PCI: mediatek-gen3: Support mt8195

In order to support mt8195 pcie node, update the yaml to support new
properties of iommu and power-domain, and update the reset-names
property to allow only one 'mac' name.

Link: https://lore.kernel.org/r/20221103025656.8714-2-tinghan.shen@mediatek.com
Signed-off-by: Jianjun Wang <jianjun.wang@mediatek.com>
Signed-off-by: TingHan Shen <tinghan.shen@mediatek.com>
Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Rob Herring <robh@kernel.org>