[Intel-gfx] [PATCH v3] drm/i915: Enable 5.4Ghz (HBR2) link rate for Displayport 1.2-capable devices

[Todd Previte]

More whitepsace cleanup.

One caveat with this patch: current link policy dictates that the driver will train the                
"wide and slow", i.e. max lanes at low speed. It will increase lanes and speed when the
specified resolution demands greater bandwidth. Consequently, the resolution will need to
be set such that the data rate exceeds the bandwidth provided by 4 lanes @ 2.4Ghz before 
the driver will use the new 5.4Ghz rate.