drm/i915: Rename ICL_AUX_ANAOVRD1 to ICL_PORT_TX_DW6_AUX

ICL_AUX_ANAOVRD1 is actually ICL_PORT_TX_DW6_AUX. Give it its proper
name, and relocate to the correct file (intel_combo_phy_regs.h).

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240229200357.7969-1-ville.syrjala@linux.intel.com


Reviewed-by: Imre Deak <imre.deak@intel.com>