arm64: dts: rockchip: Disable CPU_SLEEP idle state on rk3568-nvr

Reduce wake up latency.

Signed-off-by: Tao Huang <huangtao@rock-chips.com>
Change-Id: I704c359338e2ef556f56af63875be54335974b52

arch/arm64/boot/dts/rockchip/rk3568-nvr.dtsi

@@ -189,6 +189,10 @@
 	/delete-node/ opp-1992000000;
 };
 
+&CPU_SLEEP {
+	status = "disabled";
+};
+
 &dsi0_in_vp0 {
 	status = "disabled";
 };