UPSTREAM: KVM: arm64: Return a value from check_vcpu_requests()

A subsequent change to KVM will introduce a vCPU request that could
result in an exit to userspace. Change check_vcpu_requests() to return a
value and document the function. Unconditionally return 1 for now.

Signed-off-by: Oliver Upton <oupton@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220504032446.4133305-6-oupton@google.com


(cherry picked from commit 3fdd0459)
Signed-off-by: Will Deacon <willdeacon@google.com>
Bug: 233587962
Bug: 233588291
Change-Id: Icecbbfb7acf0f639e3650c8e4cd8a50ae5ae37cd