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dt-parser: ignore dt-validate missing schema warnings for u-boot nodes

Vincent Stehle requested to merge u-boot-nodes into master

U-Boot does publish a few Devicetree nodes to the OS with compatibles in "u-boot,*". For example, looking at the Devicetrees in U-Boot v2025.10-rc4:

u-boot,bootcount-rtc u-boot,bootcount-spi-flash u-boot,fs-loader u-boot,fwu-mdata-gpt u-boot,fwu-mdata-mtd u-boot,sysinfo-smbios

As they are clearly isolated in their own compatible "namespace" and do not harm OS boot, add a rule to ignore those errors.

While at it, add a unit test.

Signed-off-by: Vincent Stehlé vincent.stehle@arm.com

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