PCI: rcar-gen4: Rework .additional_common_init() into .init()

Rework the current complicated initialization callchain that invokes
host_init->common_init->additional_common_init() for host and
ep_init->common_init->additional_common_init() for endpoint into
simpler host_init->init() and ep_init->init() .

The init callback is now always implemented for all R-Car Gen4 SoCs;
therefore there is no need to check whether the callback is not NULL.
For R-Car S4, the .init() callback is rcar_gen4_pcie_common_init(),
for R-Car V4H and V4M, the .init() callback is implemented using a
new function rcar_gen4_v4h_v4m_pcie_init(), which calls the common
rcar_gen4_pcie_common_init() followed by R-Car V4H- and V4M-specific
hardware initialization. The hardware initialization sequence remains
unchanged.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>
[bhelgaas: drop 'dwc' tags, commit log typo]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://patch.msgid.link/20260921202823.72620-3-marek.vasut+renesas@mailbox.org

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