drm/i915: Start using REG_BIT* macros with CDCLK registers

Lets start to use REG_BIT* macros, when working with CDCLK
registers, such as CDCLK_CTL, instead of (x << 0) like expressions.

Link: https://patchwork.freedesktop.org/patch/msgid/20220901113011.12080-1-stanislav.lisovskiy@intel.com


Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>