Ucs_Xrm_CheckUnmuteCb_t check_unmute_fptr

Callback function that signals the EHC to check the mute pin state of devices before attempting unmute.

Whenever this callback function is called and the EHC has devices muted by the mute signal (INIC's MUTE pin), the EHC should ensure that the mute pin is not asserted and if so, unmute the corresponding devices.