hex number case in dts files.

[David Brown]

I've noticed an inconsistency in the case of letters in hex constants
in various dts files.  The ones that are actually numbers probably
don't really matter, the but the node names are case sensitive
strings, and in some sense do matter.

I ask because some people I've spoken with internally seem to have
strong opinions about what case hex constants should be, and it'd be
nice to be able to have some guideline about this.  Historically, I've
always seen DT hex values in lowercase.

Thanks,
David

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