staging: usbip: userspace: libsrc: remove usbip.h

Remove the library version of usbip.h because its sole purpose was to
include other headers, which is bad practice. Also modify include
guards for consistency.

Signed-off-by: matt mooney <mfm@muteddisk.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>