PCI: imx6: Allow probe deferral by reset GPIO

Some designs implement reset GPIO via a GPIO expander connected to a
peripheral bus.  One such example would be i.MX7 Sabre board where said
GPIO is provided by SPI shift register connected to a bitbanged SPI bus.
To support such designs, allow reset GPIO request to defer probing of the
driver.

Signed-off-by: Andrey Smirnov <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Lucas Stach <[email protected]>
Cc: [email protected]
Cc: Fabio Estevam <[email protected]>
Cc: Dong Aisheng <[email protected]>
Cc: [email protected]

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