drm/i915: do cck get/put inside vlv_get_cck_clock()

drm/i915: do cck get/put inside vlv_get_cck_clock()

Move towards VLV/CHV clock interfaces that handle sideband get/put
inside them instead of at the caller.

With this, we can switch to the simpler vlv_punit_get()/vlv_punit_put()
in vlv_get_cdclk().

We'll need to move vlv_init_gpll_ref_freq() outside of the existing
get/put in vlv_rps_init() and chv_rps_init().

Suggested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Acked-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://lore.kernel.org/r/480b654b6c736a03343dfd17eb130c39fd82c637.1757688216.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>