usb: ehci: do not initialise static variables

Global static variables dont need to be initialised manully.

Signed-off-by: Jason Wang <wangborong@cdjrlc.com>
Link: https://lore.kernel.org/r/20210609094726.62459-1-wangborong@cdjrlc.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>