ARM: dts: rockchip: Enable SMP bring-up for RK3128

For bring-up of the non-boot cpu cores the enable-method for RK3036 can be
re-used.
This adds a (small) chunk of SRAM for execution of the SMP trampoline code
and the respective enable-method property to the cpus.

Signed-off-by: Alex Bee <knaerzche@gmail.com>
Link: https://lore.kernel.org/r/20230829214004.314932-8-knaerzche@gmail.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

Author: knaerzche

arch/arm/boot/dts/rockchip/rk3128.dtsi

@@ -27,6 +27,7 @@
 	cpus {
 		#address-cells = <1>;
 		#size-cells = <0>;
+		enable-method = "rockchip,rk3036-smp";
 
 		cpu0: cpu@f00 {
 			device_type = "cpu";
@@ -86,6 +87,11 @@
 		#address-cells = <1>;
 		#size-cells = <1>;
 		ranges = <0 0x10080000 0x2000>;
+
+		smp-sram@0 {
+			compatible = "rockchip,rk3066-smp-sram";
+			reg = <0x00 0x10>;
+		};
 	};
 
 	pmu: syscon@100a0000 {