hw/arm/sbsa-ref: fix typo breaking PCIe IRQs

hw/arm/sbsa-ref: fix typo breaking PCIe IRQs

Fixing a typo in a previous patch that translated an "i" to a 1
and therefore breaking the allocation of PCIe interrupts. This was
discovered when virtio-net-pci devices ceased to function correctly.

Cc: qemu-stable@nongnu.org
Fixes: 48ba18e6d3f3 ("hw/arm/sbsa-ref: Simplify by moving the gic in the machine state")
Signed-off-by: Graeme Gregory <graeme@nuviainc.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 20200821083853.356490-1-graeme@nuviainc.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>