kms_frontbuffer_tracking: remove offscreen-{cur,spr} subtests

It doesn't make sense to write on the sprite/cursor plane of the
"offscreen" screen. The pick_target() function was just returning the
offscreen_fb pointer for those cases, so we were not really testing
any cursor or sprite code. So the tests were just the same as
offscreen-pri.

That kills 24 subtests for each feature (72 in total).

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
1 file changed