arm64: dts: mediatek: mt8173-elm: Drop pmic's #address-cells and #size-cells

arm64: dts: mediatek: mt8173-elm: Drop pmic's #address-cells and #size-cells

The PMIC has child nodes for each of its functions. It is not an actual
bus and no addressing is involved.

Dropping the bogus properties fixes a DT validation error:

    arch/arm64/boot/dts/mediatek/mt8173-elm.dtb: pmic: '#address-cells', '#size-cells' do not match any of the regexes: 'pinctrl-[0-9]+'
            from schema $id: http://devicetree.org/schemas/mfd/mediatek,mt6397.yaml#

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202412212322.JTFpRD7X-lkp@intel.com/
Fixes: 689b937bedde ("arm64: dts: mediatek: add mt8173 elm and hana board")
Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20250108083424.2732375-1-wenst@chromium.org
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>