x86/viridian: EOI MSR should always happen in affected vCPU context

x86/viridian: EOI MSR should always happen in affected vCPU context

The HV_X64_MSR_EOI wrmsr should always happen with the target vCPU
as current, as there's no support for EOI'ing interrupts on a remote
vCPU.

While there also turn the unconditional assert at the top of the
function into an error on non-debug builds.

No functional change intended.

Requested-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Paul Durrant <paul@xen.org>
Reviewed-by: Jan Beulich <jbeulich@suse.com>