Kconfig: add description for VIDEO_MEDIATEK_VCU_MT8395

Vitor Sato Eschholzrequested to merge
vsatoes/hw_venc into mtk-android14-5.15

Add description for the config VIDEO_MEDIATEK_VCU_MT8395

Signed-off-by: Vitor Sato Eschholz vsatoes@baylibre.com

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