arm64: dts: apple: t8103: Mark ATC USB AON domains as always-on

Shutting these down breaks dwc3 init done by the firmware. We probably
never want to do this anyway. "always-on" is a plausible interpretation
of the "aon" suffix.
The t8112, t600x and t602x "ps_atc?_usb_aon" power-controller nodes are
have already "apple,always-on" properties.

Signed-off-by: Hector Martin <marcan@marcan.st>
Signed-off-by: Janne Grunau <j@jannau.net>
Link: https://patch.msgid.link/20260108-apple-dt-pmgr-fixes-v1-2-cfdce629c0a8@jannau.net
[sven: removed stale comment about PHY from commit message]
Signed-off-by: Sven Peter <sven@kernel.org>

Author: marcan

arch/arm64/boot/dts/apple/t8103-pmgr.dtsi

@@ -1103,6 +1103,7 @@
 		#power-domain-cells = <0>;
 		#reset-cells = <0>;
 		label = "atc0_usb_aon";
+		apple,always-on; /* Needs to stay on for dwc3 to work */
 	};
 
 	ps_atc1_usb_aon: power-controller@90 {
@@ -1111,6 +1112,7 @@
 		#power-domain-cells = <0>;
 		#reset-cells = <0>;
 		label = "atc1_usb_aon";
+		apple,always-on; /* Needs to stay on for dwc3 to work */
 	};
 
 	ps_atc0_usb: power-controller@98 {