drm/i915/cdclk: Hoist intel_cdclk_{pre,post}_notify() calls upwards

Now that intel_cdclk_{pre,post}_notify() are implemented via vfuncs
there is no need to keep them inside the .set_cdclk() hooks. Move
the calls one level up to intel_cdclk_set_cdclk().

We do need to adjust {skl,bxt}_cdclk_(un)init_hw() to call the wrapper
rather than the low level implementation directly, or else they would
not do the pcode notification anymore.

The two slight functional changes here are:
- bdw_set_cdclk() might theoretically bail out after doing the
  pre notification, but that codepath would only come into play
  if the hardware is seriously misprogrammed, so should never happen
- cdclk hw readout is still done from .set_cdclk(), so that now
  happens before the post notify vs. previously the readout happened
  before it. This should not matter as the readout is not affected
  by the post notify (since we can't actually read out anything from
  pcode).

Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patch.msgid.link/20260826134033.13976-15-ville.syrjala@linux.intel.com

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