UPSTREAM: drm/amd/display: Disable CRTC degamma LUT for DCN401

commit 97a0f2b5 upstream.

In DCN401 pre-blending degamma LUT isn't affecting cursor as in previous
DCN version. As this is not the behavior close to what is expected for
CRTC degamma LUT, disable CRTC degamma LUT property in this HW.

Link: https://gitlab.freedesktop.org/drm/amd/-/issues/4176


(cherry picked from commit 74162dda)
Change-Id: Iacad58fe910e898f1c519217dbb57bb4b4b49765
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>