media: platform: mtk-mdp3: remove unused VIDEO_MEDIATEK_VPU config

media: platform: mtk-mdp3: remove unused VIDEO_MEDIATEK_VPU config

Since REMOTEPROC completely replaces the VIDEO_MEDIATEK_VPU in MDP3,
unused config should be removed to avoid compilation warnings
reported on i386 or x86_64.

Warning messages:
    WARNING: unmet direct dependencies detected for VIDEO_MEDIATEK_VPU
          Depends on [n]: MEDIA_SUPPORT [=y] && MEDIA_PLATFORM_SUPPORT [=y]
        && MEDIA_PLATFORM_DRIVERS [=y] && V4L_MEM2MEM_DRIVERS [=n] &&
        VIDEO_DEV [=y] && (ARCH_MEDIATEK || COMPILE_TEST [=y])
          Selected by [y]:
          - VIDEO_MEDIATEK_MDP3 [=y] && MEDIA_SUPPORT [=y] &&
        MEDIA_PLATFORM_SUPPORT [=y] && MEDIA_PLATFORM_DRIVERS [=y] &&
        (MTK_IOMMU [=n] || COMPILE_TEST [=y]) && VIDEO_DEV [=y] &&
        (ARCH_MEDIATEK || COMPILE_TEST [=y]) && HAS_DMA [=y] && REMOTEPROC
        [=y]

Fixes: 61890ccaefaf ("media: platform: mtk-mdp3: add MediaTek MDP3 driver")
Signed-off-by: Moudy Ho <moudy.ho@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>