KVM: nVMX: Drop manual vmcs01.GUEST_INTERRUPT_STATUS.RVI check at VM-Enter

KVM: nVMX: Drop manual vmcs01.GUEST_INTERRUPT_STATUS.RVI check at VM-Enter

Drop the manual check for a pending IRQ in vmcs01's RVI field during
nested VM-Enter, as the recently added call to kvm_apic_has_interrupt()
when checking for pending events after successful VM-Enter is a superset
of the RVI check (IRQs that are pending in RVI are also pending in L1's
IRR).

Link: https://lore.kernel.org/r/20241101191447.1807602-4-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>