staging: unisys: Fix CamelCase function pointers in uisutils

Fix CamelCase names:
UisnicControlChanFunc => uisnic_control_chan_func
UissdControlChanFunc => uissd_control_chan_func
VirtControlChanFunc => virt_control_chan_func

Signed-off-by: Benjamin Romer <benjamin.romer@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>