drm/msm/a6xx: correct cx_debugbus_read arguments

First argument of cx_debugbus_read() should be 'void __iomem *' rather
than 'void * __iomem' to make sparse happy.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20211002183118.748841-1-dmitry.baryshkov@linaro.org


Signed-off-by: Rob Clark <robdclark@chromium.org>