ssb: drop BCM4328 hack for SPROM revision

This hacks leads to incorrect SPROM parsing for me and reading for example MAC
as: 00:00:00:54:00:00. Michael G. who introduced this confirmed it is not
needed anymore.
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Tested-by: Michael Gerdau <mgd@qata.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/ssb/pci.c

@@ -580,10 +580,6 @@ static int sprom_extract(struct ssb_bus *bus, struct ssb_sprom *out,
 		 * Always extract r1. */
 		out->revision = 1;
 		ssb_dprintk(KERN_DEBUG PFX "SPROM treated as revision %d\n", out->revision);
-	} else if (bus->chip_id == 0x4321) {
-		/* the BCM4328 has a chipid == 0x4321 and a rev 4 SPROM */
-		out->revision = 4;
-		ssb_dprintk(KERN_DEBUG PFX "SPROM treated as revision %d\n", out->revision);
 	}
 
 	switch (out->revision) {