imx: ventana: add pci fixup for PLX PEX860x switch GPIO

Most Gateworks Ventana boards use a PLX PEX860x PCIe switch for PCIe expansion.
These boards use GPIO on the PLX device as PERST# for the downstream ports
thus we assert this when the PLX is enumerated.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
diff --git a/include/configs/gw_ventana.h b/include/configs/gw_ventana.h
index b991b09..0e5c200 100644
--- a/include/configs/gw_ventana.h
+++ b/include/configs/gw_ventana.h
@@ -141,6 +141,7 @@
 #define CONFIG_PCI
 #define CONFIG_PCI_PNP
 #define CONFIG_PCI_SCAN_SHOW
+#define CONFIG_PCI_FIXUP_DEV
 #define CONFIG_PCIE_IMX
 #endif