drm/nouveau/kms/gv100-: use premultiplied alpha blending between planes

This is apparently the assumed default behaviour when blend properties
are absent.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2019-06-11 14:54:32 +10:00
commit 2c7442ea17