staging: hv: Rename camel cased functions in channel.c to lowercase

Rename camel cased functions in channel.c to lowercase

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