KVM: x86: Use kernel timekeeping snapshot to get walltime+TSC

Replace the KVM-private vgettsc()+/do_do_realtime() timekeeping
reimplementation with calls to the recently crafted, generic
ktime_get_snapshot_id() interface.  As noted previously, the snapshot
provides both the system time and the raw_cycles (TSC), atomically paired
using a sequence counter.

With great pleasure, delete the now unused read_tsc() and vgettsc()

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
[sean: separate from other conversions, express joy at vgettsc()'s demise]
Link: https://patch.msgid.link/20260826213303.914988-22-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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