drm/i915/mtl: Add new vswing table for C20 phy to support DP 1.4

Add vswing table to support DP 1.4 for C20 phy.

v2: rename mtl_c10_trans
v3: add default_entry for mtl_c20_trans_dp14
v4: rename mtl_cx0_trans_dp14

Bspec: 74104
Signed-off-by: Lee Shawn C <shawn.c.lee@intel.com>
Cc: Mika Kahola <mika.kahola@intel.com>
Cc: Clint Taylor <Clinton.A.Taylor@intel.com>
Cc: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Cc: Uma Shankar <uma.shankar@intel.com>
Reviewed-by: Mika Kahola <mika.kahola@intel.com>
Reviewed-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230609002038.11516-1-shawn.c.lee@intel.com