Staging: hv: remove Close from struct vmbus_channel_interface

No one calls it anymore, so remove it.

Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Hank Janssen <hjanssen@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --cc drivers/staging/hv/channel_interface.c
Simple merge

diff --cc drivers/staging/hv/vmbus_api.h
Simple merge