PCI: imx6: Use "u32", not "uint32_t"

Use "u32", not "uint32_t", for consistency.  Use "tmp", not "temp", for
consistency within the driver.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Richard Zhu <Richard.Zhu@freescale.com>