soc: mediatek: mtk-svs: Commonize MT8192 probe function for MT8186

Include the additions of svs_mt8186_platform_probe() in the common
svs_mt8192_platform_probe() function, remove the former, and use the
latter as .probe() callback for MT8186.

Link: https://lore.kernel.org/r/20231121125044.78642-13-angelogioacchino.delregno@collabora.com


Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>