hw/pci-host/designware.c incorrect write to DESIGNWARE_PCIE_ATU_UPPER_TARGET register

Description of problem

I think this is a obvious bug

https://gitlab.com/qemu-project/qemu/-/blob/master/hw/pci-host/designware.c?ref_type=heads#L374

Write to register DESIGNWARE_PCIE_ATU_UPPER_TARGET, val should be shifted left to update upper 32 bit part.