[Intel-gfx] SKL GT4e can not hit the max frequency

[Gong, Zhipeng]

We have two kinds of GT4e machines:
One has the maximum frequency of 800MHZ and the actual freq only hits 600MHZ.
The other has maximum frequency of 950MHZ and the actual freq only hits only hits 800MHZ.
Even if the gt_min_freq_mhz is set to the same value as gt_max_freq_mhz, the actual freq cannot hit the max.
Is there any special settings for SKL GT4e not in i915 module?

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