usb: ehci: add spurious flag to disable overcurrent checking

usb: ehci: add spurious flag to disable overcurrent checking

This patch adds an ignore_oc flag which can be set by EHCI controller
not supporting or wanting to disable overcurrent checking. The EHCI
platform data in include/linux/usb/ehci_pdriver.h is also augmented to
take advantage of this new flag.

Signed-off-by: Florian Fainelli <florian@openwrt.org>
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Link: https://lore.kernel.org/r/20210223174455.1378-2-noltari@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>