arm64: dts: meson: radxa-zero: allow usb otg mode

Setting dr_mode to "host" prevents otg which can be useful on a board
with limited connectivity options. So don't force host mode.

Fixes: 26d1400f ("arm64: dts: amlogic: add support for Radxa Zero")
Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
Acked-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20230127103913.3386435-1-christianshewitt@gmail.com


Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>