arm64: dts: rockchip: drop dr_mode for Radxa ZERO 3W/3E

since dr_mode = "otg" can be used for USB gadget functions for U-Boot
and Linux, there is no reason to set it to "peripheral". drop it.

Fixes: 1a5c8d30 ("arm64: dts: rockchip: Add Radxa ZERO 3W/3E")
Signed-off-by: FUKAUMI Naoki <naoki@radxa.com>
Link: https://lore.kernel.org/r/20240802051508.498-1-naoki@radxa.com


Signed-off-by: Heiko Stuebner <heiko@sntech.de>