arm: dts: sync am33xx with Linux 5.9-rc7

There have been several changes to the am33xx.dtsi, so this patch
re-syncs it with Linux.

Let's add proper interconnect hierarchy for l4 interconnect instances
with the related ti-sysc interconnect module data as documented in
Documentation/devicetree/bindings/bus/ti-sysc.txt of the Linux kernel.
With l4 interconnect hierarchy and ti-sysc interconnect target module
data in place, we can simply move all the related child devices to their
proper location and enable probing using ti-sysc.

The am33xx-clock.dtsi file is the same as that of the Linux kernel,
except for the reg property of the node l4-wkup-clkctrl@0.
As for the am33xx.dtsi file, all the devices with drivers not yet
implemented and those I was able to test with this patch have been moved
to am33xx-l4.dtsi. In case of any regressions, problem devices can be
reverted by moving them back and removing the related interconnect
target module node.

Signed-off-by: Dario Binacchi <dariobin@libero.it>
diff --git a/arch/arm/dts/am335x-draco.dtsi b/arch/arm/dts/am335x-draco.dtsi
index b38ff55..2c125fc 100644
--- a/arch/arm/dts/am335x-draco.dtsi
+++ b/arch/arm/dts/am335x-draco.dtsi
@@ -20,11 +20,6 @@
 	};
 
 	ocp {
-		uart0: serial@44e09000 {
-			pinctrl-names = "default";
-			pinctrl-0 = <&uart0_pins>;
-			status = "okay";
-		};
 
 		i2c0: i2c@44e0b000 {
 			pinctrl-names = "default";
@@ -112,6 +107,12 @@
 	status = "disabled";
 };
 
+&uart0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart0_pins>;
+	status = "okay";
+};
+
 &uart4 {
 	status = "disabled";
 };