Drivers: hv: balloon: Enable dynamic memory protocol negotiation with Windows 10...

Drivers: hv: balloon: Enable dynamic memory protocol negotiation with Windows 10 hosts

Support Win10 protocol for Dynamic Memory. Thia patch allows guests on Win10 hosts
to hot-add memory even when dynamic memory is not enabled on the guest.

Signed-off-by: Alex Ng <alexng@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit b6ddeae1603dfa55e857ba1520f5acea83f8cf1c)

Orabug: 21886720
Signed-off-by: Jason Luo <zhangqing.luo@oracle.com>