Staging: unisys: use Linux coding convention for function names

Change function names to conform to Linux kernel coding convention.
    ULTRA_VBUS_init_channel() --> ultra_vbus_init_channel()
    VBUSCHANNEL_devInfoToStringBuffer() --> vbuschannel_devinfo_to_string()
    VBUSCHANNEL_sanitize_buffer() --> vbuschannel_sanitize_buffer()
    VBUSCHANNEL_itoa() --> vbuschannel_itoa()

Signed-off-by: Ken Cox <jkc@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>