MLK-10243 usb: chipidea: udc: enable and disable BSV irq only for ID change

MLK-10243 usb: chipidea: udc: enable and disable BSV irq only for ID change

Since BSV irq is only used for B-device, this patch correct the setting of
BSVIE of otgsc only for case of ID change, that is:
- In otg fsm mode, ID change from 0 to 1 means otg state from A_IDLE to
  B_IDLE; ID change from 1 to 0 means otg state from B_IDLE to A_IDLE, so
  only disable BSVIE if the current state is B_IDLE(to be update to A_IDLE),
  only enable BSVIE if the current state is A_IDLE(to be update to B_IDLE).
- In non-otg-fsm mode, it's already correct.

This fix the bug of MLK-10243.

Signed-off-by: Li Jun <jun.li@freescale.com>
Signed-off-by: Peter Chen <peter.chen@freescale.com>
(cherry picked from commit c6151e8cc4a01128cbab4b26c09f859cfcd7ff39)