KVM: PPC: Quieten message about allocating linear regions

This is printed once for every RMA or HPT region that get
preallocated.  If one preallocates hundreds of such regions
(in order to run hundreds of KVM guests), that gets rather
painful, so make it a bit quieter.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>