[POWERPC] Remove leftover printk in isa-bridge.c

This printk() appears twice in the same function.  Only the latter one
in the inval_range: section appears to be legitimate.

Signed-off-by: Nate Case <ncase@xes-inc.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>