PCI: rcar-gen4: Use .post_deinit() to handle dw_pcie_ep_init() failures

Implement .post_deinit() callback in R-Car Gen4 'struct dw_pcie_ep_ops'
which asserts reset and stops the clock. This undoes start of clock and
deassert of reset performed in .pre_init(), in case dw_pcie_ep_init() fails
after successful call of .pre_init() callback.

The use of .post_deinit() callback correctly handles the clock and reset
unwind, unlike the call of rcar_gen4_pcie_ep_deinit() in dw_pcie_ep_init()
which could not discern at which point the dw_pcie_ep_init() failed and can
attempt to stop clock and assert reset twice.

Since dw_pcie_ep_deinit() also invokes the .post_deinit() callback, drop
calls to rcar_gen4_pcie_ep_deinit() in both rcar_gen4_add_dw_pcie_ep() and
dw_pcie_ep_init_registers() fail paths and rcar_gen4_remove_dw_pcie_ep() to
avoid duplicate stop of clock and assert of reset, and drop no longer used
rcar_gen4_pcie_ep_deinit() entirely.

Initialize PCIEDMAINTSTSEN early in rcar_gen4_pcie_ep_pre_init() to 0, to
make sure that edma_int bits will never be left set in case of failure of
dw_pcie_ep_init(), and will only be set in case dw_pcie_ep_init() succeeds.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Koichiro Den <den@valinux.co.jp>
Reviewed-by: Koichiro Den <den@valinux.co.jp>
Link: https://patch.msgid.link/20260821122808.238248-2-marek.vasut+renesas@mailbox.org

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