drm/i915/cx0: Add MTL+ .get_dplls hook

drm/i915/cx0: Add MTL+ .get_dplls hook

Add .get_dplls function pointer for MTL+ platforms
to support dpll framework. Reuse the ICL function
pointer.

v2: Getting configuration either for a C10 or on the PTL port B
    eDP on TypeC PHY case for a C20 PHY PLL. Hence refer to this
    case as "non_tc_phy" instead of "c10phy".
v3: Fix comment to "eDP over TypeC" (Suraj)
    Fix pll id as separate variable (Suraj)

Signed-off-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Mika Kahola <mika.kahola@intel.com>
Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Link: https://lore.kernel.org/r/20251117104602.2363671-20-mika.kahola@intel.com