chipidea: imx: add usb vbus power polarity setting

Cherry-picked from 8cc3298159f6330f1e843644b119f16e5059d15f.
If the vbus is controlled by ehci port power bit, we need set power
polarity of vbus enable signal according to the vbus power
supply chip on board.

Change-Id: I63ee496f6bd14470a2607876a09ba4a7e8b97b20
Signed-off-by: Haoran.Wang <elven.wang@nxp.com>
4 files changed