drm/msm/dp: Drop unused dp_debug struct

The members of struct dp_debug are no longer used, so the only purpose
of this struct is as a type of the return value of dp_debug_get(), to
signal success/error.

Drop the struct in favor of signalling the result of initialization
using an int, then merge dp_debug_get() with dp_debug_init() to avoid
the unnecessar boilerplate code.

Signed-off-by: Bjorn Andersson <[email protected]>
Reviewed-by: Dmitry Baryshkov <[email protected]>
Patchwork: https://patchwork.freedesktop.org/patch/585343/
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Dmitry Baryshkov <[email protected]>

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