drm/mediatek: Use devm_platform_get_and_ioremap_resource() in mtk_hdmi_ddc_probe()

A wrapper function is available since the commit 890cc39a
("drivers: provide devm_platform_get_and_ioremap_resource()").
Thus reuse existing functionality instead of keeping duplicate
source code.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Link: https://patchwork.kernel.org/project/dri-devel/patch/2a4ecf78-20e7-4678-a67d-0d66956b07cc@web.de/


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