The pcode mailbox has two data registers. So far we've only ever used the one, but that's about to change. Expose the second data register to the callers of sandybridge_pcode_read(). Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Clint Taylor <Clinton.A.Taylor@intel.com> Reviewed-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com> Reviewed-by: Matt Roper <matthew.d.roper@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190521164025.30225-1-ville.syrjala@linux.intel.com