drm/nouveau/disp/dp: allow 540MHz data rate
drm/nouveau/disp/dp: allow 540MHz data rate

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=76319
Signed-off-by: Ilia Mirkin <bcbbb7aa705ec3a5fc5824c01a845186c3d62fca@alum.mit.edu>
Signed-off-by: Ben Skeggs <d9f27fb07c1e9f131223ad827fa5179f3846c30b@redhat.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs