drm/vc4: drv: Remove the DSI pointer in vc4_drv

stable inclusion
from stable-v5.10.137
commit 1f98187a7c155d7a92ab576ac5e5d8012f4450f0
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I60PLB

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=1f98187a7c155d7a92ab576ac5e5d8012f4450f0



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[ Upstream commit 51f4fcd9 ]

That pointer isn't used anywhere, so there's no point in keeping it.

Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20201203132543.861591-2-maxime@cerno.tech


Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>
Reviewed-by: Wei Li <liwei391@huawei.com>