KVM: x86: Drop now-superflous setting of l1tf_flush_l1d in vcpu_run()

KVM: x86: Drop now-superflous setting of l1tf_flush_l1d in vcpu_run()

Now that KVM unconditionally sets l1tf_flush_l1d in kvm_arch_vcpu_load(),
drop the redundant store from vcpu_run().  The flag is cleared only when
VM-Enter is imminent, deep below vcpu_run(), i.e. barring a KVM bug, it's
impossible for l1tf_flush_l1d to be cleared between loading the vCPU and
calling vcpu_run().

Acked-by: Kai Huang <kai.huang@intel.com>
Link: https://lore.kernel.org/r/20240522014013.1672962-7-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>