drm/i915/adl_p: Add ddc pin mapping

From VBT, ddc pin info suggests the following mapping:
    VBT                                    DRIVER
    DDI TC1->ddc_pin=3 should translate to PORT_TC1->0x9
    DDI TC2->ddc_pin=4 should translate to PORT_TC2->0xa
    DDI TC3->ddc_pin=5 should translate to PORT_TC3->0xb
    DDI TC4->ddc_pin=6 should translate to PORT_TC4->0xc

Adding pin map to facilitate this translation as we cannot use existing
icl ddc pin map due to conflict with DDI C and DDI TC1 info.

Bspec:20124

v2:
  - Changed Author to Tejas Upadhyay

Cc: Clinton Taylor <Clinton.A.Taylor@intel.com>
Cc: Matt Atwood <matthew.s.atwood@intel.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Acked-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Lee Shawn C <shawn.c.lee@intel.com>
Signed-off-by: Tejas Upadhyay <tejaskumarx.surendrakumar.upadhyay@intel.com>
Signed-off-by: Raviteja Goud Talla <ravitejax.goud.talla@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211203073720.3823371-1-ravitejax.goud.talla@intel.com