RTEMS | GICD_IROUTER with wrong offset (#5223)

[geng zhu (@zhugengyu2023)]

geng zhu created an issue: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5223



## Summary
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- the GICD_IROUTER in arm-giv3.h defined wrong following the ARM gicv3 doc, the 
real work offset is 0x6000 however

```
  uint64_t gicd_irouter[992];  --> offset is defined as 0x6100
  uint64_t gicd_iroutere[4096];
} gic_dist;

```

- the wrong offset definition in arm doc

![image](/uploads/c5098e2b16d46d3d45c980c3a9ebb942/image.png)

- the correct offset definition in working code

https://github.com/Xilinx/qemu/blob/master/hw/intc/gicv3_internal.h

![image](/uploads/cc83fc040cd140adfc29bab45054a21f/image.png){width=688 
height=510}

## Steps to reproduce

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5223
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