arm64: defconfig: Enable RZ/V2M xHCI and USB3.1 DRD controller support

Increase build and test coverage by enabling RZ/V2M xHCI and USB3.1 DRD
controller support.

Note that the latter cannot be modular, as USB_XHCI_RCAR is builtin.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/ff10d09c1a00f7024679a249e696e8c8a52d671e.1678286291.git.geert+renesas@glider.be