Drivers: hv: vss: full handshake support

Drivers: hv: vss: full handshake support

Introduce VSS_OP_REGISTER1 to support kernel replying to the negotiation
message with its own version.

Add small change to vss_handle_handshake for RH compatibility

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Tested-by: Alex Ng <alexng@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Orabug: 25970637
(cherry picked from commit cd8dc0548511efff7a97d978f989ce67a883f9a5)
Signed-off-by: Jack Vogel <jack.vogel@oracle.com>