sparc64: Set cpu state to offline when stopped

sparc64: Set cpu state to offline when stopped

CPU needs to be marked offline before stopping it. When not marked
offline, the xcall receives HV_EWOULDBLOCK and so assumes that not all
CPUs received the message, and retries. After 10000 retries, it finally
fails with fatal mondo timeout.

Signed-off-by: Vijay Kumar <vijay.ac.kumar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit cffb3e76818fee4763a2ce5f2b1eca2d7885e2cf)

Signed-off-by: Vijay Kumar <vijay.ac.kumar@oracle.com>
Orabug: 24297427