MLK-17077 staging: typec: clear vbus change event in irq handler

MLK-17077 staging: typec: clear vbus change event in irq handler

For vbus change event, we need read the vbus status to clear
the alert. Current code do this in queue work, this has problem
on single core running, the queue work of vbus change may have
no chance to be scheduled as we continue receive the vbus change
event in threaded irq.

Acked-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Li Jun <jun.li@nxp.com>