ARM: dts: r8a7742-iwg21d-q7: Enable HSUSB, USB2.0 and xHCI

Enable support for HSUSB, USB2.0 and xHCI on iWave RZ/G1H carrier board.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Marian-Cristian Rotariu <marian-cristian.rotariu.rb@bp.renesas.com>
Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
Link: https://lore.kernel.org/r/1595005225-11519-3-git-send-email-prabhakar.mahadev-lad.rj@bp.renesas.com


Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>