MLK-9824-1 usb: chipidea: otg: clear b_conn when ends session

MLK-9824-1 usb: chipidea: otg: clear b_conn when ends session

This patch is to clear the flag b_conn when turns off vbus to end a session.
when otg fsm is a_host -> a_suspend -> a_wait_vfall -> a_idle, current otg
fsm implementation does not handle disconnect event since the disconnection
does not happen while a_host state, so the b_conn is still set when in a_idle,
this patch clear b_conn flag after turn off vbus.

Signed-off-by: Li Jun <b47624@freescale.com>
(cherry picked from commit 043b79264051454de18488cb746ee617d86f3568)
(cherry picked from commit 7476c27df7a8bbc66f2269804cac58319fecf3d2)