usb: chipidea: Fixed a few typos in comments

Fixed typos in comments of 2 drivers/usb/chipidea files

Signed-off-by: Mickael Maison <mickael.maison@gmail.com>
Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>