general: add missing copyright notes.
This commit fixes all copyright notes, using "git blame" as a reference. For simple files I just added a 2-lines boilerplate about being WR and GPL. Some parts I left untouched: trivial-init and related files (unclear to me what this is, and pf-microcode.h is magic binary pfilter values). tools/lm32-etheruart: I don't know what this is and who the author is libsdbfs: this comes from another repo and I'd better not change it sfp_lib.h and hal_shmem.h: I lost track about the origin of this, among the several packages. Signed-off-by: Alessandro Rubini <firstname.lastname@example.org>
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