kvm tools: Drop "notsc" no longer needed kernel option

kvm tools: Drop "notsc" no longer needed kernel option

"notsc" option has been used to avoid APIC calibration
problem at early days when we didn't support APIC at all.

Now with KVM APIC emulation used there is no longer need
for this option. Drop it.

Reported-by: Richard Weinberger <richard@nod.at>
Tested-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>