macppc: print uninorth/u3 revision number

[Martin Pieuchot]

Simple diff to print UniNorth's revision so it becomes easy to know 
which AGP chipset people have without looking at the 'eeprom -p' output.

before:
        memc0 at mainbus0: uni-n
after:
        memc0 at mainbus0: uni-n rev 0xd2

Ok?

Index: dev/uni_n.c
===================================================================
RCS file: /cvs/src/sys/arch/macppc/dev/uni_n.c,v
retrieving revision 1.15
diff -u -p -r1.15 uni_n.c
--- dev/uni_n.c 19 Jun 2006 22:41:35 -0000      1.15
+++ dev/uni_n.c 15 Nov 2012 11:04:42 -0000
@@ -73,18 +73,23 @@ memcmatch(struct device *parent, void *c
 void
 memcattach(struct device *parent, struct device *self, void *aux)
 {
+       struct memc_softc *sc = (struct memc_softc *)self;
        struct confargs *ca = aux;
-       int len;
+       u_int32_t rev;
        char name[64];
-       struct memc_softc *sc = (struct memc_softc *)self;
+       int len;
 
-       len = OF_getprop(ca->ca_node, "name", name, sizeof name);
+       len = OF_getprop(ca->ca_node, "name", name, sizeof(name));
        if (len > 0)
                name[len] = 0;
 
+       len = OF_getprop(ca->ca_node, "device-rev", &rev, sizeof(rev));
+       if (len < 0)
+               rev = 0;
+
        uni_n_config(name, ca->ca_node);
 
-       printf (": %s\n", name);
+       printf (": %s rev 0x%x\n", name, rev);
 
        memc_attach_children(sc, ca->ca_node);
 }