rendercopy/gen8: Also emit 3DSTATE_WM_DEPTH_STENCIL.

rendercopy/gen8: Also emit 3DSTATE_WM_DEPTH_STENCIL.

rendercopy was failing to emit 3DSTATE_WM_DEPTH_STENCIL, which is a new
packet on Broadwell.  Mesa emits this packet.

This appears to fix various tests on a fresh boot, when Mesa has never
run.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=78890
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=78891
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=78935
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=78936
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=78937
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=78938
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Tested-by: Guo Jinxian <jinxianx.guo@intel.com>
Signed-off-by: Ben Widawsky <benjamin.widawsky@intel.com>