intel: Don't use special stencil span accessors
intel: Don't use special stencil span accessors

The special stencil span accessors, as set by intel_span_init_funcs.
perform software W detiling. Since intel_renderbuffer_map() now uses
MapRenderbuffer, rb->Data points to an *untiled* stencil buffer.

Fixes several Piglit tests on gen7.

Reviewed-by: Eric Anholt <96f164ad4d9b2b0dacf8ebee2bb1eeb3aa69adf1@anholt.net>
Reviewed-by: Kenneth Graunke <bd2562f754ec92342f93f61c25d731e290a2ffa8@whitecape.org>
Signed-off-by: Chad Versace <a557f7f75bf28dc19ac99107f5cc7cd6b3fbdb1a@linux.intel.com>

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