UPSTREAM: KVM: arm64: Rename the KVM_REQ_SLEEP handler

The naming of the kvm_req_sleep function is confusing: the function
itself sleeps the vCPU, it does not request such an event. Rename the
function to make its purpose more clear.

No functional change intended.

Signed-off-by: Oliver Upton <oupton@google.com>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220504032446.4133305-5-oupton@google.com


(cherry picked from commit 1c6219e3)
Signed-off-by: Will Deacon <willdeacon@google.com>
Bug: 233587962
Bug: 233588291
Change-Id: I470f6f8b1f7de53bc7a2e6b65db24504c55b50b7