drm/i915/tc: Add TC PHY hooks to connect/disconnect the PHY

Add TC PHY hooks to connect/disconnect the PHY. A follow-up patch will
add the ADLP specific hooks for these.

Reviewed-by: Mika Kahola <mika.kahola@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230323142035.1432621-14-imre.deak@intel.com