staging: usbip: userspace: remove useless libsysfs includes

This patch removes useless libsysfs.h includes in various
userspace files.

Signed-off-by: Valentina Manea <valentina.manea.m@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --cc drivers/staging/usbip/userspace/src/usbip_attach.c
Simple merge

diff --cc drivers/staging/usbip/userspace/src/usbip_detach.c
Simple merge

diff --cc drivers/staging/usbip/userspace/src/usbip_network.h
Simple merge