ARM: VGIC: drop unneeded gic_restore_pending_irqs()

ARM: VGIC: drop unneeded gic_restore_pending_irqs()

In gic_restore_pending_irqs() we push our pending virtual IRQs into the
list registers. This function is called once from gic_inject(), just
before we return to the guest, but also in gic_restore_state(), when
we context-switch a VCPU. Having a closer look it turns out that the
later call is not needed, since we will always call gic_inject() anyway.
So remove that call (and the forward declaration) to streamline this
interface and make separating the GIC from the VGIC world later.

Signed-off-by: Andre Przywara <andre.przywara@linaro.org>
Reviewed-by: Julien Grall <julien.grall@arm.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>