arm64: dts: mediatek: mt2712: fix validation errors

arm64: dts: mediatek: mt2712: fix validation errors

1. Fixup infracfg clock controller binding
   It also acts as reset controller so #reset-cells is required.
2. Use -pins suffix for pinctrl

This fixes:
arch/arm64/boot/dts/mediatek/mt2712-evb.dtb: syscon@10001000: '#reset-cells' is a required property
        from schema $id: http://devicetree.org/schemas/arm/mediatek/mediatek,infracfg.yaml#
arch/arm64/boot/dts/mediatek/mt2712-evb.dtb: pinctrl@1000b000: 'eth_default', 'eth_sleep', 'usb0_iddig', 'usb1_iddig' do not match any of the regexes: 'pinctrl-[0-9]+', 'pins$'
        from schema $id: http://devicetree.org/schemas/pinctrl/mediatek,mt65xx-pinctrl.yaml#

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20240301074741.8362-1-zajec5@gmail.com
[Angelo: Added Fixes tags]
Fixes: 5d4839709c8e ("arm64: dts: mt2712: Add clock controller device nodes")
Fixes: 1724f4cc5133 ("arm64: dts: Add USB3 related nodes for MT2712")
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>