drm/mediatek: Move to devm_platform_ioremap_resource() usage

Replace platform_get_resource + devm_ioremap_resource
with just devm_platform_ioremap_resource()

Cc: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Cc: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Reviewed-by: CK Hu <ck.hu@mediatek.com>
Signed-off-by: Anusha Srivatsa <asrivats@redhat.com>
Link: https://patchwork.kernel.org/project/dri-devel/patch/20250213-mem-cocci-v3-v1-4-93466d165349@redhat.com/


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