[2/5] dtc: Use flex's YY_USER_ACTION feature to avoid code duplication

[Jon Loeliger]

> Current, every lexer rule starts with some boiler plate to update the
> yylloc value for use by the parser.  One of the rules, even mistakenly
> has a redundant allocation to one of the members.
> 
> This patch uses the flex YY_USER_ACTION macro hook, which is executed
> before every rule to avoid this duplication.
> 
> Signed-off-by: David Gibson <david at gibson.dropbear.id.au>

Applied.

Thanks,
jdl