Staging: hv: fix up sparse warning in hyperv_utils.c

The function isn't called by anyone else, so mark it static.

Also remove version.h, as it is not needed.

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