x86: kvm: x86: Remove unnecessary initial values of variables

bitmap and khz is assigned first, so it does not need to initialize the
assignment.

Signed-off-by: Li zeming <zeming@nfschina.com>
Link: https://lore.kernel.org/r/20230817002631.2885-1-zeming@nfschina.com


Signed-off-by: Sean Christopherson <seanjc@google.com>