PCI: dwc: Move dw_pcie_msi_init() to dw_pcie_setup_rc()

PCI: dwc: Move dw_pcie_msi_init() to dw_pcie_setup_rc()

If the host which makes use of IP's integrated MSI Receiver losts
power during suspend, we need to reinit the RC and MSI Receiver in
resume. But after we move dw_pcie_msi_init() into the core, we have no
API to do so. Usually the dwc users need to call dw_pcie_setup_rc() to
reinit the RC, we can solve this problem by moving dw_pcie_msi_init()
to dw_pcie_setup_rc().

Link: https://lore.kernel.org/r/20210325152604.6e79deba@xhacker.debian
Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Rob Herring <robh@kernel.org>