RTEMS | arm/xilinx_zynq_microzed: Microzed timer is running 3 times the required frequency (#5149)

[Chris Johns (@chris)]

Chris Johns created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5149

Assignee: Chris Johns

The BSP default for the Micorzed BSP is:

```
$ ./waf bspdefaults --rtems-bsps=arm/xilinx_zynq_microzed | grep BSP_ARM_A9MPCORE_PERIPHCLK
BSP_ARM_A9MPCORE_PERIPHCLK = 100000000
```

Building a FSBL with Linux using Vivado 2019-2 and the Avnet BSP then using it to boot RTEMS results in 3 times the requested frequency.

The following code gets the correct frequency:

```
uint32_t a9mpcore_clock_periphclk(void) {
  return 333333333;
}
```

The BSP should default to the settings provided by the Avnet BSP for Viviado.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5149
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