i965/fb: Use meta path for stencil blits
i965/fb: Use meta path for stencil blits

This is effective only on gen8 for now as previous generations still
go through blorp.

Cc: "10.2" <59f39c0db42d4479a46b02d4d2bc11120e37bb44@lists.freedesktop.org>
Signed-off-by: Topi Pohjolainen <749697f19798b7f640b17221fd283b903825f071@intel.com>
Reviewed-by: Kenneth Graunke <bd2562f754ec92342f93f61c25d731e290a2ffa8@whitecape.org>

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