drm/msm/dpu: Fix sm8250_mdp register length

stable inclusion
from stable-5.10.56
commit 4a6841921cc818ebaa10a74b799867d149de2d1e
bugzilla: 176004 https://gitee.com/openeuler/kernel/issues/I4DYZ4

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=4a6841921cc818ebaa10a74b799867d149de2d1e



--------------------------------

[ Upstream commit b910a020 ]

The downstream dts lists this value as 0x494, and not
0x45c.

Fixes: af776a3e ("drm/msm/dpu: add SM8250 to hw catalog")
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
Link: https://lore.kernel.org/r/20210628085033.9905-1-robert.foss@linaro.org


Signed-off-by: Rob Clark <robdclark@chromium.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Chen Jun <chenjun102@huawei.com>
Acked-by: Weilong Chen <chenweilong@huawei.com>
Signed-off-by: Chen Jun <chenjun102@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>