drm/i915/tc: Use the tc_phy prefix for all TC PHY functions

For consistency use the tc_phy prefix for all TC PHY functions.

Reviewed-by: Mika Kahola <mika.kahola@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230323142035.1432621-5-imre.deak@intel.com