common: fdt_support: Add missing cpu_to_fdt32() to fdt_pci_dma_ranges()

The fdt_pci_dma_ranges() cannot work on e.g. ARM, since the DT entries
endianness is not adjusted at all. Fix this.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Tom Rini <trini@konsulko.com>