When adding a new board, it can be non-obvious what went wrong if the
board is not immediately detected. Add an option to trace through
socinfo addresses for a specific board to print out useful addresses
as a debugging aid. Also clean up some error handling, mostly among
the tracing code.

Change-Id: I65f4a38b95912b81676f44cd371751abc96aae9e

The specification of boards of the parser is not very clean. Re-write
it into an easier to read fashion.

Change-Id: Icae5b8421cf574ee910e4702fcf14d29378ed703