We don't need to initialize the BO since blorp updates the clear color
BO content with fast clear value i.e ANV_HZ_FC_VAL for depth surface.
With this approach, we can get rid of possibility of corruption since we
are no longer sharing the same clear BO for depth formats.
Closes: #3614
Signed-off-by: Sagar Ghuge <sagar.ghuge@intel.com>
Reviewed-by: Nanley Chery <nanley.g.chery@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9941>
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