ENGR00221317-02 Mx6 USB host: set stop_mode_config when any USB host enabled

ENGR00221317-02 Mx6 USB host: set stop_mode_config when any USB host enabled

The Mx6 phy sometimes work abnormally after system suspend/resume if the 1V1
is off. So we should keep the 1V1 active during the system suspend if any USB
host enabled.
- Add stop_mode_config to 1 with refcount
- Add mutex to protect the refcount and HW_ANADIG_ANA_MISC0 register
- If stop_mode_config is set as 1, the otg  vbus wakeup system will be supported

Signed-off-by: make shi <b15407@freescale.com>