ARM: dts: rockchip: clean up the abuse of disable-wp

The mmc.txt 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 controller.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm/boot/dts/rk3066a-mk808.dts

@@ -101,7 +101,6 @@
 
 &mmc1 {
 	bus-width = <4>;
-	disable-wp;
 	non-removable;
 	pinctrl-0 = <&sd1_clk &sd1_cmd &sd1_bus4>;
 	pinctrl-names = "default";