easepi-r2: fix kernel cmdline 'root=' overridden by device tree

which cause initramfs load rootfs failed

Signed-off-by: Liangbin Lian <jjm2473@gmail.com>

Author: jjm2473

arch/arm64/boot/dts/rockchip/rk3588-easepi-r2.dts

@@ -25,6 +25,8 @@
 		mmc2 = &sdhci;
 	};
 
+	/delete-node/ chosen;
+
 	adc-keys-0 {
 		compatible = "adc-keys";
 		io-channels = <&saradc 0>;