drm/i915: Perform a central cdclk state sanity check

WARN if the cdclk state doesn't match what we expect after programming.
And let's remove the WARN from bdw_set_cdclk() that's trying to achieve
the same thing in a more limite fashion.

Also take the opportunity to refactor the code to use a common function
for dumping out a cdclk state.

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

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