drm/i915: Reuse RPLU cdclk fns for MTL+

MTL/LNL use the same cdclk functions as RPLU albeit with different
tables. Having separate tables and not requiring special handling
for the platforms, reuse RPLU cdclk functions.

v2: Update subject and the commit message(Jani)

Cc: Gustavo Sousa <gustavo.sousa@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240228214854.2530205-1-radhakrishna.sripada@intel.com