dtc: Trivial lexer cleanups

[Jon Loeliger]

So, like, the other day David Gibson mumbled:
> This patch applies a couple of tiny cleanups to the lexer.  The
> not-very-useful 'WS' named pattern is removed, and the debugging
> printf() for single character tokens is moved to the top of the
> action, which results in less confusing output when LEXDEBUG is
> switched on (because it goes before the printf()s for possible
> resulting lexer state changes).
> 
> Signed-off-by: David Gibson <david at gibson.dropbear.id.au>

Applied.

jdl