usb: early: fixed coding style issue related to : operator

Fixed a space issue relating to ":" operator found
by checkpatch.pl tool in drivers/usb/early/ehci-dbgp.c

Signed-off-by: Jeffrin Jose <ahiliation@yahoo.co.in>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>