fix: KVM: x86: Get exit_reason as part of kvm_x86_ops.get_exit_info (v5.16)

See upstream commit :

  commit 0a62a0319abb92c89a4f91c2dbfcaee4e47f37ca
  Author: David Edmondson <david.edmondson@oracle.com>
  Date:   Mon Sep 20 11:37:35 2021 +0100

    KVM: x86: Get exit_reason as part of kvm_x86_ops.get_exit_info

    Extend the get_exit_info static call to provide the reason for the VM
    exit. Modify relevant trace points to use this rather than extracting
    the reason in the caller.

Change-Id: I28903e658eb7cbfc6666e35ba4cffba5e49d1445
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>