PCI: endpoint: pci-epf-{mhi/test}: Move DMA initialization to EPC init callback

To maintain uniformity across EPF drivers, move DMA initialization to EPC
init callback. This will also allow us to deinit DMA during PERST# assert
in the further commits.

For EPC drivers without PERST#, DMA deinit will only happen during driver
unbind.

Link: https://lore.kernel.org/linux-pci/[email protected]
Tested-by: Niklas Cassel <[email protected]>
Signed-off-by: Manivannan Sadhasivam <[email protected]>
Signed-off-by: Krzysztof Wilczyński <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Niklas Cassel <[email protected]>

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