usbip: add missing compile time generated files to .gitignore

Add the following files to .gitignore

compile
libsrc/libusbip_la-sysfs_utils.lo
libsrc/libusbip_la-usbip_device_driver.lo
libsrc/libusbip_la-usbip_host_common.lo

Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>