[U-Boot] Silence "make clean"

[Wolfgang Denk]

Dear Marek Vasut,

In message <201211131453.18366.marex at denx.de> you wrote:
> 
> > 	make[1]: Entering directory `.../doc/DocBook'
> > 	make[1]: Leaving directory `.../doc/DocBook'
> > 
> > We didn't have this before, and we shouldn't have this.
> > 
> > Can you please fix this regression?  Thanks.
> 
> Is this not fixed in latest sources? I believe Tom fixed it.

It is not fixed in current top of tree in master, i. e.
v2013.01-rc1-78-g59852d0


Best regards,

Wolfgang Denk

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