drm/i915/gt: Setup a default migration context on the GT

drm/i915/gt: Setup a default migration context on the GT

Set up a default migration context on the GT and use it from the
selftests.
Add a perf selftest and make sure we exercise LMEM if available.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Co-developed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210617063018.92802-10-thomas.hellstrom@linux.intel.com