RTEMS | fdt01: Warnings from dts used (#5653)

[Joel Sherrill (@joel)]

Issue created by Joel Sherrill: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5653



## Summary

The test _fdt01_ references a Microblaze dts file which generates warnings. I saw these warnings building sparc/leon3.

```
../../../bsps/microblaze/microblaze_fpga/dts/system.dts:331.25-375.5: Warning (spi_bus_bridge): /amba_pl/axi_quad_spi at 44a00000: node name for SPI buses should be 'spi'
testsuites/libtests/fdt01/system.dtb: Warning (spi_bus_reg): Failed prerequisite 'spi_bus_bridge'
../../../bsps/microblaze/microblaze_fpga/dts/system.dts:17.4-19: Warning (clocks_property): /cpus/cpu at 0:clocks: cell 0 is not a phandle reference
../../../bsps/microblaze/microblaze_fpga/dts/system.dts:245.4-19: Warning (clocks_property): /amba_pl/dma at 41e00000:clocks: cell 0 is not a phandle reference
../../../bsps/microblaze/microblaze_fpga/dts/system.dts:261.4-19: Warning (clocks_property): /amba_pl/gpio at 40000000:clocks: cell 0 is not a phandle reference
../../../bsps/microblaze/microblaze_fpga/dts/system.dts:283.4-19: Warning (clocks_property): /amba_pl/gpio at 40010000:clocks: cell 0 is not a phandle reference
../../../bsps/microblaze/microblaze_fpga/dts/system.dts:305.4-19: Warning (clocks_property): /amba_pl/i2c at 40800000:clocks: cell 0 is not a phandle reference
../../../bsps/microblaze/microblaze_fpga/dts/system.dts:379.4-19: Warning (clocks_property): /amba_pl/timer at 41c00000:clocks: cell 0 is not a phandle reference
../../../bsps/microblaze/microblaze_fpga/dts/system.dts:395.4-19: Warning (clocks_property): /amba_pl/serial at 40600000:clocks: cell 0 is not a phandle reference
```

My RTEMS configuration was:

```
[sparc/leon3]
BUILD_SAMPLES=True
BUILD_TESTS=True
RTEMS_DEBUG=False
RTEMS_POSIX_API=True
```

Since these warnings do not come from the compiler, they do not trigger a build error.

## Steps to reproduce

Configure with any ini file which enables fdt01 and build. I saw it with "./waf >/dev/null". 


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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5653
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