arm64: defconfig: Enable RZ/G2L USBPHY control driver

RZ/G2L SoC supports USBPHY control,so enable it in ARM64 defconfig.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://lore.kernel.org/r/20210812151808.7916-2-biju.das.jz@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>