drm/i915/selftests: Add context batchbuffers registers to live_lrc_fixed

Add per ctx bb and indirect ctx bb register locations to live_lrc_fixed
for verification.

Signed-off-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20200423224159.22078-1-chris@chris-wilson.co.uk