arm64: dts: rockchip: fix vcc_host1_5v pin assign on rk3328-rock64

This patch fixes pin assign of vcc_host1_5v. This regulator is
controlled by USB20_HOST_DRV signal.

ROCK64 schematic says that GPIO0_A2 pin is used as USB20_HOST_DRV.
GPIO0_D3 pin is for SPDIF_TX_M0.

Signed-off-by: Katsuhiro Suzuki <katsuhiro@katsuster.net>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>