s390x/cpumodel: fix max STFL(E) bit number

Not that it would matter in the near future, but it is actually 2048
bytes, therefore 16384 possible bits.
Reviewed-by: NChristian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: NThomas Huth <thuth@redhat.com>
Signed-off-by: NDavid Hildenbrand <david@redhat.com>
Message-Id: <20170928134609.16985-4-david@redhat.com>
Signed-off-by: NCornelia Huck <cohuck@redhat.com>

target/s390x/cpu_features.c

@@ -381,7 +381,7 @@ void s390_add_from_feat_block(S390FeatBitmap features, S390FeatType type,
 
     switch (type) {
     case S390_FEAT_TYPE_STFL:
-       nr_bits = 2048;
+       nr_bits = 16384;
        break;
     case S390_FEAT_TYPE_PLO:
        nr_bits = 256;