arm64: dts: ls1028a: fix the offset of the reset register

The offset of the reset request register is 0, the absolute address is
0x1e60000. Boards without PSCI support will fail to perform a reset:

[   26.734700] reboot: Restarting system
[   27.743259] Unable to restart system
[   27.746845] Reboot failed -- System halted

Fixes: 8897f325 ("arm64: dts: Add support for NXP LS1028A SoC")
Signed-off-by: Michael Walle <michael@walle.cc>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/fsl-ls1028a.dtsi

@@ -101,7 +101,7 @@ optee {
 	reboot {
 		compatible ="syscon-reboot";
 		regmap = <&rst>;
-		offset = <0xb0>;
+		offset = <0>;
 		mask = <0x02>;
 	};