staging: unisys: refactor ULTRA_VBUS_CHANNEL_OK_SERVER

Fix the name to SPAR_VBUS_CHANNEL_OK_SERVER and fix the CamelCase parameter:

actualBytes => actual_bytes

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