media: mtk-vcodec: remove allocated dma_parms

Commit 9495b7e9 ("driver core: platform: Initialize dma_parms for
platform devices") included dma_parms in platform_device. There's no need
to allocate again.

Fixes: 13483fc2 ("media: mtk-vcodec: set dma max segment size")
Suggested-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>