KVM: x86: Refactor cpuid_mask() to auto-retrieve the register

Use the recently introduced cpuid_entry_get_reg() to automatically get
the appropriate register when masking a CPUID entry.

No functional change intended.

Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>