MLK-9638-6 usb: common: otg: test: clear otg_hnp_reqd flag when it's invalid

MLK-9638-6 usb: common: otg: test: clear otg_hnp_reqd flag when it's invalid

This patch clears otg_hnp_reqd feature related flags when the HNP test ends.
There are two otg fsm paths to end this feature request:
- b_peripheral --> b_wait_acon --> b_idle: we clear them when entering b_idle;
- b_peripheral --> b_wait_acon --> b_host --> b_peripheral : we clear them
  when leaving b_host.

Acked-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Li Jun <b47624@freescale.com>
(cherry picked from commit 39d25f04ed047e15f23b44e8465ce46257547df7)
(cherry picked from commit f92c4e5794a278946d3f4e7c8bc30e3e43a80c28)