intel/blorp: Assign correct view while clearing depth stencil

We never saw any failures regarding this typo but it's good to assign
correct stencil view while constructing blorp_params.

Fixes: 0cabf93b "intel/blorp: Add an entrypoint for clearing depth and stencil"

Signed-off-by: Sagar Ghuge <sagar.ghuge@intel.com>
Reviewed-by: Nanley Chery <nanley.g.chery@intel.com>
(cherry picked from commit ce208be2)