eDP 1.4 supports 4-5 extra link rates in additional to current 2 link
rate.  Create a structure to store the DPLL divisor data to improve
readability.

v2: Fix the gen4_dpll/pch_dpll initialization to C99
designated initializers, and use a single loop for all platforms. (Jani and Daniel)
Signed-off-by: NChon Ming Lee <chon.ming.lee@intel.com>
[danvet: Fix up checkpatch warnings.]
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>