arm64: defconfig: Enable PWM and USB for R-Car

Enables PWM controller, USB-DMAC that is used by HS-USB, USB 3.0
peripheral controller and USB 3.0 PHY for R-Car SoCs.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>