Documentation: ABI: usb: chipidea: Update Li Jun's e-mail

The freescale.com e-mail domain is no longer active for quite some
time. Switch Li Jun's e-mail address to the NXP domain.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Peter Chen <peter.chen@nxp.com>