drm/i915/cx0: Set ssc_enabled for c20 too

ssc_enabled does not get set for c20 phy.
We makes sure we set ssc_enabled for both c10 and c20.

Bspec: 74491
Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250122053022.1544881-1-suraj.kandpal@intel.com
Link: https://patchwork.freedesktop.org/patch/msgid/20250122053022.1544881-1-suraj.kandpal@intel.com