drm/mediatek: cec: Delete redundant printing of return value

platform_get_irq() has already checked and printed the return value,
the printing here is nothing special, it is not necessary at all.

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