PCI: Use of_pci_dma_range_parser_init() to reduce duplication

Use the new of_pci_dma_range_parser_init() to reduce code duplication.

Signed-off-by: Marc Gonzalez <marc_gonzalez@sigmadesigns.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>