drm/i915: Use intel_de_wait_for_*() in cnl+ cdclk programming

Replace the hand rolled PLL lock bit waits with intel_de_wait_for_*().

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210430153444.29270-6-ville.syrjala@linux.intel.com


Reviewed-by: Jani Nikula <jani.nikula@intel.com>