dtc: Remove space from flex command line

[Jon Loeliger]

So, like, the other day David Gibson mumbled:
> Author: Geoff Levand <geoffrey.levand at am.sony.com>
> 
> Apparently some versions of flex don't correctly parse the -o
> parameter, if there's a space between the -o and its argument.  So,
> this patch removes it.
> 
> Signed-off-by: David Gibson <david at gibson.dropbear.id.au>

Applied.

Note, the way to specify the Author of a git patch is to
include the "From: Name <addr>" line at the beginning of
the patch's log message.

Oh, and, the author's SOB should be there too...? :-)

Thanks,
jdl