i965/meta: Stencil blits

i965/meta: Stencil blits

v2: Create the intel renderbuffer with level hardcoded to zero instead
    of overriding it in the surface state configuration. Also moved the
    dimension adjustments for tiling, mip level, msaa into the render
    buffer creation. Finally prepares for another blit path needed for
    miptree updownsampling.
v3 (Ken): Dropped unnecessary memory context for "ralloc_asprintf()"

Cc: "10.2" <mesa-stable@lists.freedesktop.org>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Signed-off-by: Topi Pohjolainen <topi.pohjolainen@intel.com>