arm64: dts: rockchip: remove disable-wp from rk3308-roc-cc emmc node

The mmc-controller.yaml didn't explicitly say disable-wp is
for SD card slot only, but that is what it was designed for
in the first place.
Remove all disable-wp from emmc or sdio controllers.

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Link: https://lore.kernel.org/r/20191219121954.2450-1-jbx6244@gmail.com


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