drm/i915: kill intel_dp_link_clock()
drm/i915: kill intel_dp_link_clock()

Use drm_dp_bw_code_to_link_rate insead. It's the same thing, but
supports DP_LINK_BW_5_4 and is also used by the other drivers.

From Paulo Zanoni
9fa5f6522e6eecb5ab20192a264a29ba4f2f4e85 in mainline linux

One of two backported commits to prevent a black screen
on a Lenovo IdeaPad Yoga 2 Pro as reported/debugged by Steven Wilson.

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars