drm/mediatek: mtk_dpi: Use devm_platform_ioremap_resource()

Instead of the open-coded platform_get_resource, devm_ioremap_resource
switch to devm_platform_ioremap_resource(), also dropping the useless
struct resource pointer, which becomes unused.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Fei Shao <fshao@chromium.org>
Reviewed-by: CK Hu <ck.hu@mediatek.com>
Link: https://patchwork.kernel.org/project/dri-devel/patch/20230726082245.550929-6-angelogioacchino.delregno@collabora.com/


Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>