ARM: dts: r8a7744: USB 2.0 host support

Describe internal PCI bridge devices, USB phy device and
link PCI USB devices to USB phy.

Signed-off-by: Biju Das <biju.das@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>