drm/i915/cnl: Fix wrpll math for higher freqs.

Spec describe all values in MHz. We handle our
clocks in KHz. This includes the best_dco_centrality that was
forgot in the same unity as spec. Consequently we couldn't
get a good divider for high frequenies. Hence HDMI 2.0 wasn't
working.

Spec tells 999999 for initial best_dco_centrality meaning the
max value in MHz.
Since we convert dco from MHz to KHz we also need to convert
this initial best_doc_centrality to 999999000 or 999999999
or even better, to the max that its variable allow.

This patch also replaces the use of "* KHz(1)" with the values
directly on KHz to avoid future confusion.

v2: Use U32_MAX instead of random 99999 as spec tells. (Ville).

Cc: Ville Syrjälä <[email protected]>
Cc: Shashank Sharma <[email protected]>
Cc: Mika Kahola <[email protected]>
Cc: Manasi Navare <[email protected]>
Cc: James Ausmus <[email protected]>
Signed-off-by: Rodrigo Vivi <[email protected]>
Reviewed-by: Ville Syrjälä <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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