drm/i915/cnl: Allow 2 pixel per clock on Cannonlake.

This is heavily based on a initial patch provided by Ville
plus all changes provided later by Ander.

As Geminilake, Cannonlake also supports 2 pixels per clock.

Different from Geminilake we are not implementing the 99% Wa.
But we can revisit that decision later if we find out
any limitation on later CNL SKUs.

v2: Rebase on top of commit 'd305e0614601 ("drm/i915: Track
minimum acceptable cdclk instead of "minimum dotclock")'

v3: When fixing HDMI on CNL I noticed that I missed to convert
    back the doubled pixel rate to cdclk.

Cc: Paulo Zanoni <[email protected]>
Cc: Ville Syrjälä <[email protected]>
Cc: Dhinakaran Pandiyan <[email protected]>
Cc: Jani Nikula <[email protected]>
Signed-off-by: Rodrigo Vivi <[email protected]>
Reviewed-by: Paulo Zanoni <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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