ARM: dts: exynos: add USB DWC3 supplies to Chromebook Peach Pit

Add required voltage regulators for USB DWC3 block on Exynos5420
Chromebook Peach Pit board.  Due to lack of board schematics, use same
regulators as on Odroid XU board (using same MAX77802 PMIC).

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Link: https://lore.kernel.org/r/20220123111644.25540-8-krzysztof.kozlowski@canonical.com