With TWL6030-usb, VBUS SESS_VLD and SESS_END events are not generated
as expected. When these interrupts are enabled, charger VBUS detection
interrupt does not get generated. So USBOTG has to be dependent on charger
VBUS interrupts.
So added one bit for USBOTG and changed the handler to call the
USBOTG handler whenever there is a charger VBUS interrpt.

VBUS SESS_VLD and SESS_END event generation issue is under debug with
HW team. This fix might not be required once after fixing the issue.
Signed-off-by: NBalaji TK <balajitk@ti.com>
Signed-off-by: NHema HK <hemahk@ti.com>
Cc: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>