drm/i915: Use REG_BIT() & co. in intel_combo_phy_regs.h

Modernize the ICL+ combo PHY register refinitions by using
REG_BIT() & co.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240229200357.7969-2-ville.syrjala@linux.intel.com


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