PCI: dwc: Add dw_pcie_ep_ops->post_deinit() callback

If .pre_init() succeeds but subsequent initialization fails, it is
mandatory to correctly undo the hardware configuration which the
.pre_init() callback did. Introduce a .post_deinit() callback to do exactly
that, undo what the .pre_init() callback did. Usually, that means stop the
clock, assert reset, and possibly program some registers to quiesce the
hardware. Invoke the .post_deinit() callback in dw_pcie_ep_deinit() to
retain functional symmetry.

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/20260821122808.238248-1-marek.vasut+renesas@mailbox.org

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