PCI: rcar: Save MSI controller in pci_sys_data
PCI: rcar: Save MSI controller in pci_sys_data

Save MSI controller in pci_sys_data instead of assigning MSI controller
pointer to every PCI bus in .add_bus().

[bhelgaas: use struct rcar_msi.chip, not ctrl]
Signed-off-by: Yijing Wang <ac442ed3e729ed4f09d087e9c319e1c47c72d6f1@huawei.com>
Signed-off-by: Bjorn Helgaas <f10ec01be0c6b54271af5c550cd257810bdf3268@google.com>
KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs