linux-imx

MLK-16522-1 usb: cdns3: change cdns3_role_start work flow

When it goes to start new role, the interrupt may be occurred before
role_start returns, but at this time, the cdns->role is still the old
role, so the interrupt handler will make mistake.

In this commit, we set desired role before role_start, if the role_start
has failed and the desired role is different with current one, it tries
to back current role.

BuildInfo:
- SCFW 1f59442e, IMX-MKIMAGE fb52c576, ATF
- U-Boot 2017.03-imx_v2017.03+g34be5a2

Acked-by: Li Jun <jun.li@nxp.com>
Signed-off-by: Peter Chen <peter.chen@nxp.com>
(cherry picked from commit 0f21c9e70b4a98b45f62c5164857c13ee5427c96)