MIPS: AR7: Fix USB slave mem range typo

Signed-off-by: Alexander Clouter <alex@digriz.org.uk>
To: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/919/


Signed-off-by: Ralf Baechle <ralf@linux-mips.org>