drm/i915/skl: If needed sanitize bios programmed cdclk

Especially in cases where pre-os does not enable display, cdclk might
not be in sane state. During sanitization initialize cdclk with maximum
value till we get dynamic cdclk support.

v2: Check if BIOS programmed correctly rather than always calling init
    - Do validation of programmed cdctl and what it is expected
    - Only do slk_init_cdclk if validation failed else reuse BIOS
      programmed value

v3: Move the validation logic in a separate sanitize function (Ville)

v4: No need to check LCPLL after sanitize and use max_cdclk_freq instead
    of hardcoded value (Ville)

Cc: Imre Deak <[email protected]>
Cc: Ville Syrjälä <[email protected]>
Signed-off-by: Shobhit Kumar <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
Reviewed-by: Ville Syrjälä <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>

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